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Pentair System 2 Lower Half Tank Shell | 27001-0009S

Pentair SKU: 27001-0009S

Pentair System 2 Lower Half Tank Shell | 27001-0009S

Pentair SKU: 27001-0009S
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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)

  • 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

  • PLD50, PLD70
  • 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.

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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.
Questions about returns? View our return policy.

Hours Of Operation:

Monday - Friday: 7:00 am to 5:00 pm Phoenix Time

Saturday: 8:00 am to 2:00 pm

Sunday: Closed

  • We do not ship on Saturday or Sunday.
  • Orders totaling more than $300 will require signature confirmation upon delivery.
  • We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
  • Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
  • Expedited shipping options are available at checkout.

Return Policy:

  • Products that are received damaged will receive a refund in store credit.
  • Most products are eligible for return within 30 days of receipt, except where noted below.
  • To initiate a return, please complete an RMA form prior to sending your item back.
  • Original shipping costs are non-refundable and will be deducted from the return credit.
  • Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
  • Some returns will be charged an automatic 15% restocking fee.
  • We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
  • Please complete the return form to receive your RMA number and return shipping label.
  • Chemical products are not eligible for return under any circumstances.
  • The Pentair Colorsync 618031 is not eligible for return.
  • Pool cleaners are not eligible for return.
  • Opened seals and o-rings are not eligible for return.
  • Capacitors are not eligible for return.
  • Plastic popup tools are not eligible for return.
  • Automation components and circuit boards are not eligible for return.
  • If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
  • Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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