Classic Port Caps

Our classic port caps are designed to fit standard GL45 and GL38 glass bottles, as well as Nalgene 38-430 plastic bottles. They feature 1/4-28 threaded ports within a PTFE insert, with expanded PTFE gaskets. Each port has a through-hole for 1/8" OD tubing, machined at a 10 degree angle; push your tubing through the cap to supply your system. Also available are Carboy manifold caps with larger holes alongside the 1/4-28 holes.

These caps are the safety solution for scientists, chemical hygienists, and researchers worldwide, designed to ensure proper delivery and waste containment of industrial chemicals and solvents. Our closed system capabilities reduce harmful emissions which are potentially hazardous to employees and our environment.