Drum Spill Platform Accessories such as clips and sump to sump attachments. Combine drum modular units as capacity needs increase. Use joining clips to firmly lock units together and expand your storage space. Sumps remain separate and Clips can be removed for easy repositioning. The Sump-to-Sump Drain Kit allows you to join Drum Accumulation Centers together on-site, for full compliance with EPA and UFC regulations when combined sump capacities meet 66 gallons.