The Pentair Tank Bottom (178731Z) is the OEM replacement lower tank shell for the Clean & Clear RP cartridge filter series and the SEP Separation Tank series (SEP 48, SEP 72, SEP 96, and SEP 144). What It Does The tank bottom forms the structural lower half of the filter or separation tank housing, containing the water under pressure during filtration. A cracked, warped, or leaking tank bottom compromises system pressure integrity and must be replaced to restore safe, effective operation. Match the part number stamped or molded on your existing tank bottom before ordering to confirm the correct fit. Specifications Pentair Part Number 178731Z Part Name Tank Bottom Quantity Included Each (1) Fits Into Brand Equipment Line Model / Part Number Notes Pentair Clean & Clear RP Filters CLEAN & CLEAR RP — Pentair Separation Tank — SEP Series SEP 48 Fits SEP 48/72/96/144 Pentair Separation Tank — SEP Series SEP 72 Fits SEP 48/72/96/144 Pentair Separation Tank — SEP Series SEP 96 Fits SEP 48/72/96/144 Pentair Separation Tank — SEP Series SEP 144 Fits SEP 48/72/96/144 Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering. Pro Tip Before ordering, inspect the tank clamp ring and any associated O-rings or gaskets at the tank seam — these components are subject to the same stress as the tank body and are worth replacing at the same time to ensure a leak-free reassembly. Consult your equipment's installation manual for torque specifications when reassembling the tank halves.
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