Pentair / Sta-Rite 27001-0009S Tank Bottom (Lower Tank Shell) with Lock Ring | System:2 PLM & PLD Filters
The Pentair / Sta-Rite 27001-0009S is the OEM lower tank shell (tank bottom) used on select Sta-Rite System:2 modular
filter systems. This part replaces the bottom half of the filter tank when the original is cracked, warped, leaking, or has damaged
locking-ring interfaces. It is commonly supplied as a tank bottom assembly that includes the locking hardware used to secure the filter.
Common Compatibility (Verify Your Filter Model)
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Sta-Rite System:2 Modular Media filters: PLM series
-
Sta-Rite System:2 Modular D.E. filters: PLD series
- Often specified for System:2 PLM/PLD systems manufactured 2009 and later (model/revision dependent)
Typical Models This Tank Bottom Is Listed For
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PLD50, PLD70
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PLM100, PLM125, PLM150, PLM175, PLM200, PLM300
Always confirm fit by matching your filter’s model number and parts diagram, and by verifying the locking-ring style used on your system.
What This Part Does
- Replaces the lower tank body to restore structural integrity and leak-free operation
- Provides the seating surface for the internal module and the tank seal/O-ring
- Interfaces with the lock ring and safety latch hardware to clamp the tank halves together
Common Reasons to Replace
- Cracks, stress fractures, or seepage from the tank body
- Damage at the lock ring/posi-lok interface that prevents proper clamping
- Warping from heat, sun exposure, freeze damage, or improper tightening
- Persistent leaks after replacing the tank O-ring and confirming clean, undamaged sealing surfaces
What’s Typically Included
- Lower tank shell (tank bottom)
- Lock ring / Posi-Lok ring hardware (when supplied as an assembly)
- Safety latch hardware (when supplied as an assembly)
- Adapter fitting (when supplied as an assembly)
Contents can vary by supplier packaging. Confirm what’s included with your specific listing if you are replacing only certain pieces.
Installation Notes
- Shut off the pump and relieve all pressure from the filter before opening the tank.
- Inspect the tank O-ring; replace it if flattened, cracked, swollen, or nicked.
- Clean and inspect all sealing surfaces—debris or scale can cause leaks even with a new tank bottom.
- Clamp/lock the ring evenly and follow the manufacturer’s tightening and latch procedure (do not over-tighten).
- After restart, check for slow seepage once the system is fully pressurized.
Related Products (Aqua Pool Supply)
Maintenance Tips
- Record your clean starting pressure after reassembly—use it as a baseline for future cleaning/service intervals.
- Keep the tank O-ring clean and lightly lubricated with pool-safe silicone lubricant to reduce pinching and leaks.
- Do not expose the filter tank to unnecessary stress (overtightening, impacts, or freezing with water inside).
- If the tank area is in direct sun, provide shade when possible to help extend plastic component life.
