Combine units to create your own customized spill-control system. Low-profile centers only measure 5.5‐inches (140‐mm) high for easy handling of drums. Made with 100% recycled polyethylene, these accumulation centers are nearly impervious to chemicals, including acids and corrosives. Seamless construction eliminates leaks, making them ideal for drum filling and dispensing operations. Self-locating grates won’t ride‐up, and are removable for easy cleaning. Combine 2-, 4-, 6-, and 8-drum modular units to create your own customized system. Use the optional joining clips to firmly lock units together. Sumps remain separate and clips can be removed for easy repositioning. Also available in non-recycled yellow color. Use optional Sump-to-Sump™ drain kit (includes joining clips and transfer tube) for applications requiring a continuous sump. Kit allows you to join centers together, on-site, for full compliance with regulations when sump capacities reach 71‐gallons (270‐liters). Kit includes one pair stainless steel joining clips, one pair rubber grommets, one polytetrafluoroethylene (PTFE) transfer tube. (Patent No US 6,622,879,B1) EPA compliant, supports SPCC, and meets NFPA 1 2009 edition and IFC fire codes.