Collection: Volume discount products
-
CX250Z7 Hayward O-Ring, Lock Knob
Vendor:Hayward
CX250Z7Regular price $12.20Regular priceUnit price per$29.20Sale price $12.20 -
O-Ring, 5-3/4" ID, 1/8" Cross Section, Generic, O-108
Vendor:Horizon Spa & Pool Parts
90-423-5256Regular price $9.90Regular priceUnit price per$17.10Sale price $9.90Liquid error (snippets/card-product line 647): comparison of String with 0 failed -
Bolt, Jacuzzi, P Series/VSP150, Motor To Seal Plate
Vendor:Jacuzzi
Regular price $10.30Regular priceUnit price per$21.30Sale price $10.30 -
U9-161 Pentair O-Ring, Lid
Vendor:Pentair
U9-161Regular price $18.80Regular priceUnit price per$41.50Sale price $18.80Liquid error (snippets/card-product line 647): comparison of String with 0 failed -
SX200Z3 Hayward O-Ring, Valve Bulkhead
Vendor:Hayward
SX200Z3Regular price $14.40Regular priceUnit price per$33.70Sale price $14.40Liquid error (snippets/card-product line 647): comparison of String with 0 failed -
SX200Z14 Hayward O Ring, 1" Od
Vendor:Hayward
SX200Z14Regular price $11.80Regular priceUnit price per$27.50Sale price $11.80Liquid error (snippets/card-product line 647): comparison of String with 0 failed -
SPX0728H Hayward O-Ring, End Connector
Vendor:Hayward
SPX0728HRegular price $12.10Regular priceUnit price per$28.50Sale price $12.10Liquid error (snippets/card-product line 647): comparison of String with 0 failed -
R172223Z Pentair O-Ring, Housing Rainbow
Vendor:Pentair
R172223Regular price $13.20Regular priceUnit price per$32.00Sale price $13.20Liquid error (snippets/card-product line 647): comparison of String with 0 failed -
50151700 Pentair O-Ring, Lid
Vendor:Pentair
254Regular price $20.00Regular priceUnit price per$45.00Sale price $20.00Liquid error (snippets/card-product line 647): comparison of String with 0 failed -
14971-SM20E7 Pentair O-Ring, Cover
Vendor:Pentair
14971-SM20E7Regular price $25.30Regular priceUnit price per$57.70Sale price $25.30 -
Sold out
35505-1313 Pentair O-Ring
Vendor:Pentair
35505-1313Regular price $13.00Regular priceUnit price per$31.30Sale price $13.00Sold out -
85015100 Pentair O-Ring, Skimmer Bottom
Vendor:Pentair
85015100Regular price $16.00Regular priceUnit price per$34.80Sale price $16.00Sold out -
79116900 Pentair O-Ring, Bulb Assembly
Vendor:Pentair
79116900Regular price $14.10Regular priceUnit price per$32.60Sale price $14.10Sold out -
Sold out
354634 Pentair O-Ring, Pacfab
Vendor:Pentair
B004VTFWZYRegular price $15.70Regular priceUnit price per$33.90Sale price $15.70Sold out -
154661 Pentair O-Ring,Air Bleeder,Pacfab
Vendor:Pentair
154661Regular price $10.30Regular priceUnit price per$21.50Sale price $10.30Sold out
Volume Discount Products
Stock up on essential pool and spa replacement seals with volume discount O-rings, gaskets, and hardware from Hayward, Pentair, and Jacuzzi — OEM replacement parts for filters, pumps, valves, and chemical feeders. PST Pool Supplies offers these high-turnover maintenance parts starting from $9.60.
O-rings are the most frequently replaced consumable in pool equipment — every filter lid, pump strainer, valve bulkhead, and chemical feeder relies on O-ring seals to maintain pressure and prevent leaks. This collection brings together the most commonly needed OEM O-ring replacements across major equipment brands: Hayward O-rings include the CX250Z7 Lock Knob O-ring ($11.50) for ProGrid and other Hayward filter lids, the SX200Z3 Valve Bulkhead O-ring ($13.70) for Hayward sand filter multiport valves, the SX200Z14 1\" OD O-ring ($11.10), and the SPX0728H End Connector O-ring ($11.40) used in Hayward pump and filter connections. Pentair O-rings include the 35505-1313 ($12.30), U9-161 Lid O-ring ($18.00), R172223Z Housing Rainbow O-ring ($12.50) for Rainbow chemical feeders, 79116900 Bulb Assembly O-ring ($13.40), 50151700 Lid O-ring ($19.30), and 14971-SM20E7 Cover O-ring ($24.60). The generic O-108 O-ring (5-3/4\" ID, 1/8\" cross-section, $9.90) covers cross-brand applications where standard sizing is applicable. A Jacuzzi VSP150 motor-to-seal-plate bolt ($9.60) rounds out the hardware selection for spa pump servicing.
Keeping a supply of frequently replaced O-rings on hand eliminates service delays — when a filter lid seal fails mid-season, having the correct replacement O-ring immediately available prevents days of downtime waiting for a single part shipment. OEM O-rings ensure the correct durometer (hardness), material specification (typically Buna-N), and dimensional tolerance for a leak-free seal. Always apply silicone-based O-ring lubricant during installation — never petroleum-based products, which degrade Buna-N rubber over time.
Shop volume discount pool parts at PST Pool Supplies and keep your equipment running without interruption.
Frequently Asked Questions
How do I know which O-ring I need for my pool equipment?
Identifying the correct O-ring requires matching the part number to your specific equipment model: Method 1 — OEM part number lookup: find the model number of your equipment (usually on a label on the pump, filter, or valve body) and look up the service parts list. Every Hayward, Pentair, and Jacuzzi equipment model has a published parts diagram with part numbers for every O-ring. The part numbers in this collection (CX250Z7, SPX0728H for Hayward; 35505-1313, U9-161 for Pentair) are direct lookups from manufacturer parts diagrams. Method 2 — measure the existing O-ring: if the part number is unknown, measure the old O-ring: (1) Inside diameter (ID) — the diameter of the hole in the center of the O-ring when lying flat. (2) Cross-section diameter — the thickness of the O-ring material itself. The generic O-108 in this collection (5-3/4" ID, 1/8" cross-section) covers applications where these dimensions match across multiple equipment brands. Method 3 — equipment location identification: the part names in this collection indicate location — "Lid O-ring" (U9-161, 50151700) seals the pump strainer or filter lid; "Valve Bulkhead O-ring" (SX200Z3) seals the multiport valve to the filter tank; "Lock Knob O-ring" (CX250Z7) seals the filter air relief or lock ring assembly. Matching the O-ring description to the location where your leak or service need exists narrows the selection significantly. Always order the OEM part number when available — generic O-rings with matching dimensions may be slightly off in durometer (hardness) or material, which affects seal life.
What lubricant should I use on pool equipment O-rings and why does it matter?
The correct lubricant for pool equipment O-rings is silicone-based O-ring lubricant (Magic Lube or equivalent). Using the wrong lubricant is one of the most common causes of premature O-ring failure: Why silicone only: (1) Pool equipment O-rings are made from Buna-N (nitrile rubber) or EPDM rubber. These materials are chemically incompatible with petroleum-based products — Vaseline, WD-40, motor oil, and similar products cause Buna-N to swell, crack, and degrade rapidly. (2) Silicone lubricant is chemically inert with Buna-N and EPDM — it does not degrade the rubber. It maintains the O-ring's dimensional stability and flexibility over years of service. (3) Silicone lubricant is safe for contact with pool water, chlorine, and salt — it will not introduce contaminants or affect water chemistry. How to lubricate correctly: (1) Apply a thin, even coat of silicone lubricant around the entire circumference of the O-ring before installation. (2) The lubricant should leave a light sheen — do not glob it on. Excess lubricant doesn't improve sealing and can attract debris to the O-ring groove. (3) Also lightly lubricate the O-ring groove or mating surface on the lid or fitting body. (4) Seat the O-ring in its groove working around the perimeter — ensure it lies flat with no twists. A twisted O-ring will leak even with correct lubricant. Frequency: lubricate every time you remove and reinstall an O-ring, even if the O-ring is not being replaced. A dry O-ring installation creates micro-tears in the rubber that eventually cause leaks.
How do I find and fix an O-ring leak in my pool filter or pump?
O-ring leaks in pool equipment manifest in two ways: water leaks (water dripping from a fitting or lid joint) and air leaks (air entering the suction side, causing the pump to lose prime or show air bubbles in the pump strainer). Diagnosis and repair: Water leak at filter lid: (1) Shut off the pump and release pressure (open the air relief valve). (2) Remove the lid and inspect the O-ring — look for cracks, flat spots, embedded debris, or a groove that is damaged or dirty. (3) Clean the O-ring groove of all scale, grit, and old lubricant residue. (4) Replace the O-ring with the correct OEM part (U9-161 or 50151700 for Pentair lids; CX250Z7 for Hayward filter lid applications). (5) Lubricate and reinstall. Air leak on suction side: air leaks are harder to locate because there's no dripping water — the air is being drawn inward. Symptoms: persistent air bubbles in the pump strainer basket, pump loses prime after shutdown. Common locations: pump strainer lid O-ring (SPX0728H for Hayward end connector), union connections on the suction line, pump drain plugs. Apply pool putty or a bead of lubricant to suspected joints while the pump runs — a suction leak will draw the material inward at the leak point, confirming the location. (6) Replace the identified O-ring. Valve bulkhead leaks (SX200Z3): water leaking at the junction between the multiport valve and the filter tank indicates a failed valve seat O-ring. Shut off the pump, remove the valve, replace the O-ring, and reinstall. Applying pipe thread sealant to threaded O-ring fittings is not a substitute for O-ring replacement — address the O-ring directly.
What is the Jacuzzi VSP150 motor-to-seal-plate bolt and when does it need replacement?
The Jacuzzi VSP150 motor-to-seal-plate bolt ($9.60) is a hardware fastener that secures the motor assembly to the wet end (seal plate and volute) on Jacuzzi P Series and VSP150 spa pumps. When replacement is needed: (1) Corrosion — pump hardware is constantly exposed to pool/spa water chemistry, particularly chlorine and bromine. Stainless steel bolts resist corrosion, but bolts that have been submerged, repeatedly wet, or exposed to aggressive water chemistry will eventually corrode and seize. Seized bolts are discovered when attempting pump disassembly — attempting to remove a seized bolt risks stripping the head or breaking it off in the casting. (2) Damage during disassembly — over-torquing during a previous service, using the wrong tool, or corrosion removal attempts can damage bolt heads beyond reuse. Replace damaged bolts immediately rather than reinstalling compromised hardware. (3) Preventive replacement during seal service — when replacing a pump mechanical seal (the most common spa pump repair), the motor-to-seal-plate bolts must be removed to access the seal. Best practice is to replace the bolts at the same time as the seal — the cost is minimal and ensures the hardware is in known good condition after reassembly. Torque on reinstallation: tighten pump bolts in a cross pattern (like wheel lugs) to even clamping pressure on the seal plate gasket. Over-tightening cracks the volute or seal plate; under-tightening allows water leaks at the seal plate joint. Hand-tight plus 1/4 turn is typical for most spa pump bolt specifications — consult the Jacuzzi VSP150 service manual for the exact torque specification.
