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5.0ml Cryogenic Vial, Self-Standing, Internal Thread, sterile 50 per pack, 250/box, 1000 per case
Nest Scientific
Price: $409.555.0ml Cryogenic Vial, Self-Standing, Internal Thread, sterile 50 per pack, 250/box, 1000 per case. Features: Made of USP VI polypropylene. Autoclave at 121°C /15 Ib. Non-pyrogenic,...NST-609101Price: $409.55 -
Sample Cups for Cobas Mira and Horiba ABX Analyzers, pack/1000
Globe Scientific
Price: $64.73Sample Cups with Caps for Cobas Mira, Bio, Fara and Horiba ABX analyzers. Designed for use on automated instrumentation including the Cobas Mira®, Bio®, Fara®and Horiba ABX® analyzers...GSCI-6500BPrice: $64.73 -
Base Cover For 30 Gallon, 30 Minute EN Safety Cabinet No. 22601
Justrite
Price: $155.66Made from melamine resin laminated chipboard, this removable base cover serves to conceal the integrated transport base on the cabinet. Prevent dust and debris from collecting underneath the cabinet,...JP-22634Price: $155.66 -
Delivery Adapter Only, 24/40, Airfree®, Schlenk, each
Chemglass
Price: $246.17Delivery Adapter Only, 24/40, Airfree®, Schlenk. Apparatus for use in distillation of material such as THF or ether. Storage reservoir has a capacity of 125mL or 500mL. Extremely efficient cold...CG-AF-0720-04Price: $246.17 -
Sample Cups with Lids for Coulter Counter, 12 ml or 20 ml, case/1000
BrandTech
Price: $498.50These sample cups are made from virgin polystyrene and are designed to fit many common analyzers. Caps and lids are made of polyethylene for a snug fit. Cups and caps meet CE-IVD Directive 98/79...BT-722055Price: $498.50 -
25 ml Sample Dilution Vial, 1000 per case
Simport Scientific
Price: $361.73Made of polystyrene. Optically clear parallel sides, deionized and destaticized. The snap cap is leakproof but easily removed. Guaranteed to meet or exceed O.E.M. specifications. Each lot is tested...NDC-SIM-V130-1Price: $361.73 -
Dispensing Bottles, LDPE, 1000 ml, case/12
Dynalon
Price: $71.74Dispensing Bottles, LDPE, 1000mL. 1000 mL Sealer Cap, Bottle. LDPE dispenser bottles are supplied with a variety of closures to suit any dispensing application. Tall style 1 Liter Sealer Cap...DL-605124Price: $71.74 -
2.0ml Cryogenic Vial, Self-Standing, Internal Thread, sterile 50 per pack, 500/box, 2000 per case
Nest Scientific
Price: $566.962.0ml Cryogenic Vial, Self-Standing, Internal Thread, sterile 50 per pack, 500/box, 2000 per case. Features: Made of USP VI polypropylene. Autoclave at 121°C /15 Ib. Non-pyrogenic,...NST-607101Price: $566.96 -
Nalgene® DS6630-0250 Suspended Magnetic Stir Bars For 250mL Beaker, Floating, TFE/ETFE 54 (dia.) x 28mm
Thermo Scientific Nalgene
Price: $159.96Constantly stir tissue culture applications at a low speed with Thermo Scientific Nalgene Suspended Magnetic Stir Bars. Features: Legs can be compressed to fit through 1.5in. (38mm) openings Stir...NG-DS6630-0250Price: $159.96 -
Nalgene® 3751-24 HDPE Square Biotainer Bottles, Sterile, 4 Liter, case/24
Thermo Scientific Nalgene
Price: $715.65Nalgene InVitro Biotainer® Sterile HDPE Bottles Sterile, ready-to-use HDPE bottle suitable for freezing and storing biological reagents from -100°C to +99°C, designed specifically for...NG-3751-24Price: $715.65 -
8 oz (240mL) Natural HDPE Modern Round with 28-410 Neck Finish, Bottle Only, case/268
Qorpak
Price: $172.688oz (240ml) Natural HDPE Modern Round with 28-410 Neck Finish, Bottle Only (no caps). Modern Round Bottles feature perfectly vertical side panels to allow for label application. Translucent and...QP-PLA-06174Price: $172.68 -
Wheaton® 25mL Sample Vials, Borosilicate Glass, In Box, Clear, case/72
DWK Life Sciences
Price: $135.52WHEATON® Sample Vials, 25mL or 0.85oz Clear, 24-400 Finish with 14B Rubber Liner, Type I Borosilicate Glass (25 mL Sample Vial In Lab File, Clear) Sample Vials in Lab File are packaged in...DWK-225289Price: $135.52 -
Capacity 75 Liter, Flange I.D. (mm): 300, Valve Style: 2" BP Detachable, Overall Height mm (in.): 899 (35.4), H x W Ratio: 2:1, Inlet/Outlet Size: 1 1/2" BP, Jacket Capacity Liters: 27, each
Chemglass
Price: $22,579.30Capacity Liters: 75, Flange I.D. (mm): 300, Valve Style: 2" BP Detachable, Overall Height mm (in.): 899 (35.4), Height to Width Ratio: 2.0:1, Inlet/Outlet Size: 1 1/2" BP, Jacket Capacity Liters: 27...CG-1968-97Price: $22,579.30 -
500mL Solvent Distillation Apparatus Complete, Airfree®, Schlenk, each
Chemglass
Price: $2,136.04500mL Solvent Distillation Apparatus Complete, Airfree®, Schlenk. Apparatus for use in distillation of material such as THF or ether. Storage reservoir has a capacity of 125mL or 500mL. Extremely...CG-AF-0720-02Price: $2,136.04 -
5.0mL Cryogenic Vial, Self-Standing, Internal Thread, Sterile, 9 x 9 per rack, 6 racks per case, 486 vials per case
Nest Scientific
Price: $297.405.0mL Cryogenic Vial, Self-Standing, Internal Thread, Sterile, 9x9 per rack, 6 racks per case, 486 vials per case. Features: Made of USP VI polypropylene. Autoclave at 121°C /15 Ib...NST-609103Price: $297.40 -
0.5mL Cryogenic Vial, Self-Standing, External Thread, Sterile, 9 x 9 per rack, 16 racks per case, 1296 vials per case
Nest Scientific
Price: $390.010.5mL Cryogenic Vial, Self-Standing, External Thread, Sterile, 9x9 per rack, 16 racks per case, 1296 vials per case. Features: Made of USP VI polypropylene. Autoclave at 121°C /15 Ib...NST-618003Price: $390.01 -
0.5mL Cryogenic Vial, Self-Standing, Internal Thread, Sterile, 9 x 9 per rack, 16 racks per case, 1296 vials per case
Nest Scientific
Price: $460.360.5mL Cryogenic Vial, Self-Standing, Internal Thread, Sterile, 9x9 per rack, 16 racks per case, 1296 vials per case. Features: Made of USP VI polypropylene. Autoclave at 121°C /15 Ib...NST-618103Price: $460.36 -
2.0mL Cryogenic Vial, Self-Standing, External Thread, Sterile, 9 x 9 per rack, 12 racks per case, 972 vials per case
Nest Scientific
Price: $422.522.0mL Cryogenic Vial, Self-Standing, External Thread, Sterile, 9x9 per rack, 12 racks per case, 972 vials per case. Features: Made of USP VI polypropylene. Autoclave at 121°C /15 Ib...NST-607003Price: $422.52 -
Graduated Pyrex® Media Bottle, Borosilicate Glass, 50 ml, Low Actinic, GL32, case/4
Chemglass
Price: $142.52Media Bottle, 50mL, Round, Low Actinic, GL-32Screw Cap, Graduated. 50 mL Low Actinic Media Bottle with GL-32 Screw Cap. ideal for media, buffers, aqueous, and nonaqueous solutions, this Heavy Duty...CG-8090-50Price: $142.52 -
Nalgene Nunc Manual Screwdrivers, Red/Black, Each
Thermo Scientific Nalgene
Price: $103.93Quickly and easily cap and decap Nunc Cryobank tubes using Thermo Scientific™ Nunc™ Screwdrivers for Cryobank and Bank-It™ Systems, available in manual and electric models to suit...NG-369643Price: $103.93 -
5.0mL Cryogenic Vial, Self-Standing, External Thread, Sterile, 9 x 9 per rack, 6 racks per case, 486 vials per case
Nest Scientific
Price: $278.285.0mL Cryogenic Vial, Self-Standing, External Thread, Sterile, 9x9 per rack, 6 racks per case, 486 vials per case. Features: Made of USP VI polypropylene. Autoclave at 121°C /15 Ib...NST-609003Price: $278.28 -
4.0mL Cryogenic Vial, Self-Standing, Internal Thread, Sterile, 9 x 9 per rack, 8 racks per case, 648 vials per case
Nest Scientific
Price: $307.824.0mL Cryogenic Vial, Self-Standing, Internal Thread, Sterile, 9x9 per rack, 8 racks per case, 648 vials per case. Features: Made of USP VI polypropylene. Autoclave at 121°C /15 Ib...NST-608103Price: $307.82 -
32 oz (950mL) Natural Nylon/PE Modern Round with 28-400 Neck Finish, Bottle Only, case/68
Qorpak
Price: $199.4032oz (950ml) Natural Nylon/PE Modern Round with 28-400 Neck Finish, Bottle Only (no caps). Modern Round Bottles feature perfectly vertical side panels to allow for label application. Translucent and...QP-PLA-03377Price: $199.40 -
4.0mL Cryogenic Vial, Self-Standing, External Thread, Sterile, 9 x 9 per rack, 8 racks per case,648 vials per case
Nest Scientific
Price: $433.724.0mL Cryogenic Vial, Self-Standing, External Thread, Sterile, 9x9 per rack, 8 racks per case,648 vials per case. Features: Made of USP VI polypropylene. Autoclave at 121°C /15 Ib...NST-608003Price: $433.72 -
135oz (4,000 ml) Natural HDPE Heavyweight Handled Round Jug with 38-439 neck finish jug only, case/28
Qorpak
Price: $334.52135oz (4,000ml) Natural HDPE Heavyweight Handled Round Jug with 38-439 neck finish jug only. Natural HDPE Heavyweight Handled Round Jugs have a 190 gram weight and are ideal for high speed filling...QP-PLA-03140Price: $334.52 -
2.0mL Cryogenic Vial, Self-Standing, Internal Thread, Sterile, 9 x 9 per rack, 12 racks per case, 972 vials per case
Nest Scientific
Price: $518.412.0mL Cryogenic Vial, Self-Standing, Internal Thread, Sterile, 9x9 per rack, 12 racks per case, 972 vials per case. Features: Made of USP VI polypropylene. Autoclave at 121°C /15 Ib...NST-607103Price: $518.41 -
3.0mL Cryogenic Vial, Self-Standing, External Thread, Sterile, 9 x 9 per rack, 8 racks per case, 648 vials per case
Nest Scientific
Price: $423.853.0mL Cryogenic Vial, Self-Standing, External Thread, Sterile, 9x9 per rack, 8 racks per case, 648 vials per case. Features: Made of USP VI polypropylene. Autoclave at 121°C /15 Ib...NST-624003Price: $423.85 -
Crimper, Hand Operated, 20mm, each
Chemglass
Price: $383.37Crimper, Hand Operated, 20mm. Tools for crimping and decapping Aluminum seals on Microwave vials. The crimper has an adjustment feature which will allow it to be used with a variety of septa, discs,...CG-4930-20Price: $383.37 -
16oz (480mL) Natural Nylon/PE Modern Round with 28-400 Neck Finish, Bottle Only, case/150
Qorpak
Price: $271.2116oz (480ml) Natural Nylon/PE Modern Round with 28-400 Neck Finish, Bottle Only (no caps). Modern Round Bottles feature perfectly vertical side panels to allow for label application. Translucent and...QP-PLA-03375Price: $271.21 -
Graduated Pyrex® Media Bottle, Borosilicate Glass, 25 ml, Low Actinic, GL25, case/4
Chemglass
Price: $137.81Media Bottle, 25mL, Round, Low Actinic, GL-25Screw Cap, Graduated. 25 mL Low Actinic Media Bottle with GL-25 Screw Cap. ideal for media, buffers, aqueous, and nonaqueous solutions, this Heavy Duty...CG-8090-25Price: $137.81 -
Dispensing Carboy with Spigot, 20 Liter (5 gal) HDPE
CP Lab Safety
Price: $72.10This HDPE 5 gallon carboy comes with a spigot and an extra cap for sealing it once the spigot is no longer in use. Graduated in gallons along the side, natural color. The carboy takes a 70mm cap...SW-20010RCSPrice: $72.10 -
1.2mL Cryogenic Vial, Self-Standing, External Thread, Sterile, 9 x 9 per rack, 14 racks per case, 1134 vials per case
Nest Scientific
Price: $362.931.2mL Cryogenic Vial, Self-Standing, External Thread, Sterile, 9x9 per rack, 14 racks per case, 1134 vials per case. Features: Made of USP VI polypropylene. Autoclave at 121°C /15 Ib...NST-606003Price: $362.93 -
Capacity 30 Liter, Flange I.D. (mm): 300, Valve Style: 2" BP Detachable, Overall Height mm (in.): 627 (24.7), H x W Ratio: 1.6:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 13, each
Chemglass
Price: $12,824.43Capacity Liters: 30, Flange I.D. (mm): 300, Valve Style: 2" BP Detachable, Overall Height mm (in.): 627 (24.7), Height to Width Ratio: 1.6:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 13...CG-1968-61Price: $12,824.43 -
Capacity 50 Liter, Flange I.D. (mm): 300, Valve Style: 2" BP Detachable, Overall Height mm (in.): 650 (25.6), H x W Ratio: 1.7:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 18, each
Chemglass
Price: $17,401.76Capacity Liters: 50, Flange I.D. (mm): 300, Valve Style: 2" BP Detachable, Overall Height mm (in.): 650 (25.6), Height to Width Ratio: 1.7:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 18...CG-1968-95Price: $17,401.76 -
Capacity 10 Liter, Flange I.D. (mm): 200, Valve Style: 0-20 Sealed, Overall Height mm (in.): 490 (19.3), H x W Ratio: 1.9:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 5, each
Chemglass
Price: $6,598.23Capacity Liters: 10, Flange I.D. (mm): 200, Valve Style: 0-20 Sealed, Overall Height mm (in.): 490 (19.3), Height to Width Ratio: 1.9:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 5. Jacketed...CG-1930-30Price: $6,598.23 -
Capacity 50 Liter, Flange I.D. (mm): 300, Valve Style: 2" BP Detachable, Overall Height mm (in.): 877 (34.5), H x W Ratio: 2.5:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 17, each
Chemglass
Price: $14,435.04Capacity Liters: 50, Flange I.D. (mm): 300, Valve Style: 2" BP Detachable, Overall Height mm (in.): 877 (34.5), Height to Width Ratio: 2.5:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 17...CG-1968-81Price: $14,435.04 -
Capacity 15 Liter, Flange I.D. (mm): 200, Valve Style: 2" BP Detachable, Overall Height mm (in.): 565 (22.2), H x W Ratio: 1.8:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 7, each
Chemglass
Price: $6,902.10Capacity Liters: 15, Flange I.D. (mm): 200, Valve Style: 2" BP Detachable, Overall Height mm (in.): 565 (22.2), Height to Width Ratio: 1.8:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 7...CG-1930-33Price: $6,902.10 -
Capacity 20 Liter, Flange I.D. (mm): 200, Valve Style: 0-20 Sealed, Overall Height mm (in.): 675 (26.6), H x W Ratio: 2.2:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 8, each
Chemglass
Price: $7,851.95Capacity Liters: 20, Flange I.D. (mm): 200, Valve Style: 0-20 Sealed, Overall Height mm (in.): 675 (26.6), Height to Width Ratio: 2.2:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 8. Jacketed...CG-1930-35Price: $7,851.95 -
Capacity 15 Liter, Flange I.D. (mm): 200, Valve Style: 0-20 Sealed, Overall Height mm (in.): 565 (22.2), H x W Ratio: 1.8:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 7, each
Chemglass
Price: $7,041.15Capacity Liters: 15, Flange I.D. (mm): 200, Valve Style: 0-20 Sealed, Overall Height mm (in.): 565 (22.2), Height to Width Ratio: 1.8:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 7. Jacketed...CG-1930-32Price: $7,041.15 -
Capacity 10 Liter, Flange I.D. (mm): 200, Valve Style: 2" BP Detachable, Overall Height mm (in.): 490 (19.3), H x W Ratio: 1.9:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 5, each
Chemglass
Price: $6,460.59Capacity Liters: 10, Flange I.D. (mm): 200, Valve Style: 2" BP Detachable, Overall Height mm (in.): 490 (19.3), Height to Width Ratio: 1.9:1, Inlet/Outlet Size: 1" BP, Jacket Capacity Liters: 5...CG-1930-31Price: $6,460.59
Featured
2-Port Solvent Delivery Port Cap Deluxe Kit for GL45 Media Bottles, Black with Air Valve and 1/8" Tubing Adapter
CP Lab Safety
Price:
$60.00
2-Port Safety Cap Deluxe Kit, GL45 Thread Spin Collar, ready-to-use with Air Inlet Valve, plug and and 1/8" OD tubing adapter. All you need to supply is the 1/8" OD tubing and you're ready to work!...
ALW-GL45-2KIT
Air Inlet Evaporation Control Valve, 1/4-28 PTFE with Reminder Timer
CP Lab Safety
Price:
$34.69
Air Inlet Evaporation Control Valve with Reminder Timer (PTFE, 1/4-28)
Safeguard Your Solvent Delivery System
This valve combines solvent protection with a convenient reminder...
ALW-Air-Valve
Port Cap Kit for Solvent Delivery, GL45 with (4) 1/4-28 UNF Threaded Ports, includes Plugs
CP Lab Safety
Price:
$49.00
4-Port Solvent Delivery Port Cap Kit for GL45 Media Bottles, with Plugs, for use with 1/8" or 1/16" OD tubing in 1/4-28 adapters. Create a closed system with GL-45 safety caps, which seal to a bottle...
ALW-GL45-4KIT
Port Cap Kit for Solvent Delivery, GL45 with (3) 1/4-28 UNF Threaded Ports, Blue, includes Plugs
CP Lab Safety
Price:
$49.00
3-Port Solvent Delivery Port Cap Kit for GL45 Media Bottles, with Plugs, for use with 1/8" or 1/16" OD tubing in 1/4-28 adapters. Create a closed system with GL-45 safety caps, which seal to a bottle...
ALW-GL45-3KIT
TELLI Talking Electronic Liquid Level Indicator for Overflow Prevention
CP Lab Safety
Price:
$199.00
Try TELLI® (patent pending) to keep your lab safe from spills and overflow! TELLI is a "non-contact" liquid level mea
CP-Telli-01
2-Port Cap, GL-45 for 3/16" tubing, Air inlet valve for Solvent Delivery
CP Lab Safety
Price:
$81.00
Please note: This is a custom cap design with a minimum order of 10 pieces. Please inquire for discount pricing on larger purchases (25 or more.)
2-Port Cap for 3/16" OD tubing for Solvent Delivery,...
WF-SV-1242-2KIT
10-Port Cap, FS-70 (70mm) closure for Rieke / Hedwin Drums
CP Lab Safety
Price:
$306.00
Replacement for WF-FS70-KIT, now with 10 holes. This 10-Port Carboy Cap, 70mm (Rieke FS-70 NPS, 8TPI), Complete Kit with (1) 1/2" plug, (3) 1/4" plugs and (6) 1/4-28 Plugs. Fits the 70mm opening on...
WF-FS70-10KIT
2-Port Solvent Delivery Cap, GL-45 with Air inlet valve, FFKM, PTFE and PP
CP Lab Safety
Price:
$70.00
2-Port Solvent Delivery Cap Kit, GL45 with (2) 1/4-28 ports and a built-in air inlet valve. Choose adapters for 1/8" or 1/16" OD tubing separately (part numbers WF-AQ-1-8 and WF-AQ-1-16.) Includes...
WF-GL45-AI-2KIT
Drum Feed Safety Clamp with Chemical Filter (Choose Color)
Chemical Feed Safety Supply
Price:
$45.00
A safe, fast, effective way to increase the safety of your chemical feed system. Clamp is made of polypropylene and available in many colors to reduce cross-contamination of chemicals, by...
CFS-1117-BLUE
ECO Battery Bin-Test, Store & Recycle AA, AAA, C, D Batteries
CP Lab Safety
Now:
$39.99
Quickly check the power level remaining in most consumer batteries! The ECO Battery Bin is an environmentally friendly way to test and dispose of consumer batteries. It is a battery recycling device...
ECO-BB
4-Port Cap for Glass Bottle, GL-45, Complete Kit
CP Lab Safety
Price:
$45.00
Port Cap with 4 ports (1/4-28), PTFE insert, and blue Polypropylene collar. Fits glass bottles with a GL45 neck size. A set of plugs in included to maintain a closed system when holes are not in use...
WF-GL45-4KIT
3-Port Cap for Glass Bottle, GL-45, Complete Kit
CP Lab Safety
Price:
$50.00
Port Cap with 3 ports (1/4-28), PTFE insert, and blue Polypropylene collar. Fits glass bottles with a GL45 neck size. A set of plugs in included to maintain a closed system when holes are not in use...
WF-GL45-3KIT
4-Port Cap for Glass Bottle, GL38, Complete Kit
CP Lab Safety
Price:
$50.00
Waste line delivery port cap with 4 ports (1/4-28) fits glass bottles with a GL38 neck size. Choose your own adapters based on the tubing size you are using. A set of plugs in included for each port...
WF-GL38-4KIT
2-Port Cap for Glass Bottle, GL38, Complete Kit
CP Lab Safety
Price:
$41.00
Waste line delivery port cap with 2 ports (1/4-28) fits glass bottles with a GL38 neck size. Choose your own adapters based on the tubing size you are using. A set of plugs in included for each port...
WF-GL38-2KIT
Port Cap Carbon Filter, Activated Carbon with Flexible Adapter, 1/2" NPT
CP Lab Safety
Price:
$78.00 - $112.00
Reduce toxic fumes and noxious odors from HPLC solvent waste by vapor capture onto activated carbon exhaust filters. Includes 1 activated carbon filter, medium size, with flexible adapter,...
WF-CF-100KIT
10-Port Cap/ Filling Cap, 83B Carboy Cap, Complete Kit
CP Lab Safety
Price:
$207.00
Carboy Port Cap/ Filling Cap, 10 Port 83B Carboy Cap, Complete Kit with (1) 1/2" plug, (3) 1/4" plugs and (6) 1/4-28 Plugs. Features a PTFE waste manifold with free-spinning (non-wetted)...
WF-83B-KIT
10-Port Cap, Waste Manifold, 70mm for Nalgene® Carboy, Complete Kit
CP Lab Safety
Price:
$349.00
This 70mm Carboy Waste Cap with 10 ports is a slight update from the previous 7-port version. Vapor tight caps are designed to fit standard 70mm carboys from Thermo Fisher Nalgene®. Complete Kit...
WF-70NAL-10KIT
2- Port Cap/ Filling Cap for Nalgene® 38-430 Bottles, Complete Kit
CP Lab Safety
Price:
$37.00
Port Cap for Nalgene Plastic Bottles with a 38-430 bottles, 2-port, with (2) 1/4-28 female ports, PTFE insert with Polypropylene collar. Choose adapters based on your tubing size. A set of plugs in...
WF-38-2KIT
4" ECO Funnel® with 38-430mm cap adapter for 38mm bottles
ECO Funnel
Price:
$147.00
ECO Funnel® is the original screw-on safety funnel with a lid for laboratory waste disposal. Each model fits a specific container. This 4" ECO Funnel is designed to fit heavy-duty plastic bottles...
EF-4-38