US Seal Pump Shaft Seal North/Tristar 5/8" | PS-4280
USSeal
SKU: PS-4280
U.S. Seal PS-4280 Premium Shaft Seal Assembly (5/8″ Shaft, Wet-End Pump Seal)
The U.S. Seal PS-4280 is a heavy-duty mechanical shaft seal designed for longevity, chemical resistance, and reliable sealing in pool and spa pumps. It replaces the wet-end seal where the motor shaft penetrates the pump housing — a critical point to prevent leaks and maintain proper suction.
Key Features
- 5/8″ impeller shaft diameter — fits many common pool and spa pumps using this shaft size.
- Premium materials — Viton elastomer, carbon-graphite primary ring, ceramic sealing face, and stainless-steel hardware for enhanced chemical, heat, and wear resistance.
- Reverse-style mechanical seal — designed for wet-end installation to provide strong, pressure-resistant sealing under operating conditions.
- Ideal for saltwater, ozone, or bromine systems — superior chemical resistance improves durability compared to standard seals.
- Broad compatibility — suitable for many popular pump brands and models, reducing the need for multiple part numbers.
Specifications
- Manufacturer: U.S. Seal
- Part Number: PS-4280
- Shaft Size: 5/8″ (0.625″) impeller shaft
- Seal Type: Mechanical shaft seal (reverse-style, wet-end application)
- Seal Materials: Viton elastomer, carbon-graphite ring, ceramic sealing face, stainless-steel hardware
- Applications: Replacement seal for pool and spa pumps, including saltwater and chemically treated systems
When to Use / Replace
Install PS-4280 during pump rebuilds, seal replacements, or when existing wet-end seals show leaks, wear, or chemical degradation. Because this seal is built for demanding conditions — including salt, ozone, and high-bather load systems — it’s especially useful if your pool uses aggressive sanitizers or operates year-round.
Installation Tips
- Shut off power and drain the pump completely before disassembly.
- Thoroughly clean and inspect the shaft and seal housing — even minor nicks or corrosion can lead to seal failure.
- Lightly lubricate the new seal’s ceramic face with a pool-safe lubricant to avoid dry-start wear. Avoid petroleum-based oils that can degrade the elastomer.
- Seat the new seal carefully, ensuring flat, even contact. Reassemble the pump wet-end per manufacturer instructions, and test under pressure to verify sealing before full operation.
- Inspect periodically for leaks, especially after prolonged shutdowns or chemical imbalance events. Prompt replacement can prevent costly pump or motor damage.
Why Choose PS-4280
The U.S. Seal PS-4280 stands out for its premium materials and chemical resilience — making it a reliable, long-lasting choice for pool and spa pumps. Whether you’re performing routine maintenance or seeking a durable upgrade for saltwater or heavily treated systems, this seal helps ensure tight, leak-free operation and extends pump life by protecting internal components from water intrusion and corrosion.
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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