For the widely-used 275-gallon obround tank, Poly-Tank Containment Unit/275™ helps protect against large hazardous and costly spills up to 275-gallons. Poly-Tank 275™ is designed to save space and provide easy access to the tank and pump preventing harmful spills from contaminating your yard. Optional fitted tarp (Part #: 5275-TARP) and trickle filter.