US Seal 5/8" Pump Shaft Seal | PS-100
U.S. Seal
SKU: PS-100
U.S. Seal PS-100 Pool & Spa Pump Mechanical Shaft Seal (5/8" Shaft)
The U.S. Seal PS-100 is a general-service mechanical shaft seal used on many pool and spa pumps with a 5/8" (0.625") motor shaft. It installs between the motor shaft and the pump wet end to prevent water from leaking along the shaft into the motor. This is a common, industry-standard seal style used in residential chlorine pool applications.
Key Specifications
- Manufacturer: U.S. Seal
- Part Number: PS-100
- Shaft Size: 5/8" (0.625")
- Seal Type/Format: Type A style mechanical seal (commonly cross-referenced to John Crane Type 6 format)
- Typical Service: General residential pool/spa use (standard chlorine water)
- Typical Materials (General Service): Buna elastomers, ceramic seat, stainless hardware, molded/plastic primary components
Common Applications
- Pool and spa pump wet ends that use a 5/8" shaft seal in a Type A / Type 6 format
- Commonly referenced with pump families from Pentair/Sta-Rite, Purex, Hydrotech, and other legacy pump lines (verify by pump model or old seal match)
What This Seal Does
- Creates a watertight barrier at the motor shaft while allowing the shaft to rotate freely.
- Helps protect motor bearings, windings, and electrical components from water damage.
- Supports reliable priming and prevents small leaks that can introduce air or reduce performance.
When to Replace
- Water dripping from beneath the motor area or from the wet-end seam (common shaft seal leak symptom)
- Grinding/squealing noise after a leak (bearing damage risk from prior water exposure)
- Any time the motor is replaced or the impeller is removed for service
- Seal faces show cracking, chipping, heavy scale, or visible wear
Installation Notes
- Disconnect power at the breaker and relieve system pressure before opening the pump.
- Keep the polished seal faces clean and dry during installation; avoid touching the faces with oily/dirty hands.
- Do not apply lubricant to the polished seal faces. Lubricate only rubber O-rings/grommets as needed with pool-safe silicone lubricant.
- Clean the seal plate and mating surfaces thoroughly to prevent misalignment and repeat leaks.
- Inspect the impeller for cracks or melted plastic; a damaged impeller can quickly ruin a new seal.
Maintenance Tip
Small drips often get worse quickly. If you notice moisture under the pump, address it early to avoid motor damage. Also keep water chemistry balanced and avoid running the pump dry, which can overheat and destroy the seal faces.
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Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 8:00 am to 4:00 pm Phoenix Time
Saturday and Sunday: Closed
- Orders costing more than $300 WILL be required to have signature confirmation upon delivery.
- Handling time is typically only 1 day.
- Any item ordered after 1pm Phoenix time, may not ship same-day.
- Call us if you require expedited shipping and we can give you quotes based on your needs.
Return Policy:
- All products, except as noted below, are eligible for return up to 30 days after receipt of item.
- For returns, an RMA form must be filled out HERE or customers can call for additional help.
- Shipping costs will be deducted from all returned items.
- Any item that is missing accessories, original packaging, or is not returned in the same condition that it was received in, may be subject to a re-stocking fee up to 100% based on the condition we receive it in.
- Items broken, damaged, or inoperable due to installer error will not be refunded.
- Fill out the return form or give us a call to obtain an RMA and return shipping label.
- There are no returns on the Pentair Colorsync 618031
- No returns on pool cleaners.
- No returns on opened seals and o-rings.
- No returns on capacitors.
- If a light is returned because it "doesn't work" and it tests fine, the cost to ship and a re-stocking fee will be deducted from the refund.
- All products denied upon arrival at customers house WILL be charged the cost to ship.
- Visa Gift Card Promotions: Gift cards are sent within 14 days of the order. When accepting the Visa Gift card, you agree that if your order is returned or refunded, this amount will be deducted from the refunded amount. All Visa Gift cards are sent via email in an E-Gift Card format and are non refundable.
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