Pentair Black Upper Half Tank Shell with Air Relief Valve

The Pentair Black Upper Half Tank Shell with Air Relief Valve (Part #27001-0020S or #27001-0030S) is a genuine OEM replacement pressure dome engineered for Sta-Rite System 2 PLM Series Modular Media cartridge filters and PLD/PLDE Series Modular D.E. filters manufactured from 2009 onward. Injection-molded from a high-impact, UV-stabilized black composite thermoplastic, this rugged upper shell is designed to withstand harsh outdoor environments and demanding pool chemistry while containing intense internal hydraulic pressures. The assembly comes complete with factory safety decals and an integrated top port that hosts the manual air relief valve assembly, which serves as a critical safety vent for exhausting trapped air pockets when priming the pump.

Due to its thick-walled, heavy-duty pressure vessel construction and wide structural footprint (measuring approximately 21 inches in diameter), this component has a substantial physical weight profile:

• Actual Product Weight: Approximately 14.0 pounds.

• Packaged Shipping Weight: Typically scales at 33.2 pounds due to the massive, highly insulated box volume required to safely transport the broad dome without structural flexing or scratching.