Historical
IAPMO PS 52-2004b
MATERIAL AND PROPERTY STANDARD FOR SUMPS AND SEWAGE EJECTOR TANKS
Sumps and sewage ejector tanks shall be used when gravity drainage is impossible or impractical. The design of the tank shall be of sufficient volume to allow for the proper operation of the pump and the switch assembly.
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International Association of Plumbing and Mechanical Officials [iapmo]