Pentair Bottom Half Tank Shell with Lock Ring

The Pentair Sta-Rite Tank Bottom Shell with Lock Ring (part number 27001-0009S) is a heavy-duty lower containment vessel engineered exclusively for compact, high-velocity pool and spa filtration networks. This factory-assembled structural basin is tailored specifically for the Sta-Rite System 2 family, serving as the foundational replacement hardware for the complete line of System 2 Modular Media cartridge filters (PLM100, PLM125, PLM150, PLM175, PLM200, and PLM300) as well as the System 2 Modular Diatomaceous Earth (D.E.) filters (PLD50 and PLD70). Injection-molded from a thick-walled, glass-reinforced engineering polymer composite, this deep-set containment basin is designed to withstand harsh outdoor weathering and sustain internal system operating parameters up to 50 PSI.

The primary operational role of this lower shell is to act as the primary structural anchor for the filter's internal core elements while safely managing incoming hydraulic distribution. To provide a complete out-of-the-box structural overhaul, this kit comes pre-equipped from the factory with a 2-inch NPT threaded drain adapter fitting (24900-0510), a spring-loaded mechanical safety latch (27001-0051), and the signature large-diameter Posi-Lok™ collar lock ring assembly (27001-0054). Rather than using traditional, tool-assisted metal clamp bands, the integrated Posi-Lok ring utilizes heavy, injection-molded tracking threads that allow the user to hand-tighten the upper lid to the lower shell, snapping cleanly past the safety latch to establish an absolute watertight and airtight compression boundary that resists weeping, structural flexing, or thread separation under severe pump vibration surges. Due to its large-diameter reinforced basin shape and pre-installed locking ring hardware, this individual lower tank shell assembly carries a net product and shipping weight of approximately 40.00 pounds.