Designed as a tank within a tank, the Square Gemini Dual Containment® Tank has dual walls to help secure chemical spills or leaks. The polyethylene tank construction is compatible with a variety of hazardous chemicals. This tank is ideal for water treatment or pharmaceutical usage, and it is built with a twist-off lid and pump mounting system to attach suction or dispense hoses. Peabody saves you 22% floor space with their square tank design. SKU's 01-31922, 01-31923, 01-31924, 01-31925, 01-31927, 01-32973, 01-32974, 01-32975, 01-32976, 01-32980, 01-33086, 01-33088, 01-33087, 01-33089, and 01-33093 are not ANSI/NSF 61 Certified at this time. All other products are ANSI/NSF 61 Certified.