U.S. Seal PS-4280 5/8 in Pump Shaft Seal APCPS4280

Water dripping from the bottom of the pump where the motor meets the wet end means the shaft seal is done — and every day it leaks, it is misting the motor bearings. The U.S. Seal PS-4280 is the extra heavy-duty upgrade: a 5/8 in. shaft seal built with carbon graphite, stainless steel, and Viton rubber, made specifically for pools running salt chlorine generators or ozonators, where standard Buna seals harden and fail early. The PS-4280 is the premium direct replacement for the Hayward SPX3200SA seal used in TriStar, NorthStar, and EcoStar pumps. When in doubt, this is the seal to put in — it is the longest-lasting option in the PS line for harsh-water pumps.

🚩 PRO TIP: Handle the PS-4280 by its outer edges only — skin oil on the carbon and ceramic faces is a top cause of brand-new seals leaking. And always prime the pump before start-up: a few seconds of dry running can score a new seal's faces.

PRODUCT FEATURES & SPECIFICATIONS:

• Brand: U.S. Seal
• MPN: PS-4280
• UPC: 852661157346
• Type: Pump Shaft Seal, Extra Heavy Duty
• Shaft Size: 5/8 in.
• Materials: Carbon graphite, stainless steel, and Viton rubber
• Service Rating: Ozone and salt water pools, plus standard chlorine pools and spas
• Cross-Reference: Hayward SPX3200SA
• Compatibility: Hayward TriStar, NorthStar, and EcoStar pumps that use the SPX3200SA shaft seal
• Weight: 0.1 lb

FREQUENTLY ASKED QUESTIONS:

• Is the PS-4280 the right seal for a salt water pool? Yes — that is exactly what it is built for. The Viton elastomer and heavy-duty faces hold up to salt systems and ozonators that eat standard seals.
• Does the PS-4280 replace the Hayward SPX3200SA? Yes. The PS-4280 is the extra heavy-duty equivalent of the SPX3200SA for Hayward TriStar, NorthStar, and EcoStar pumps — same fit, upgraded materials.
• Why is my pump leaking underneath? A drip or spray at the shaft, between the pump housing and the motor, is the signature of a worn shaft seal. Replace it promptly — the leak reaches the motor bearings and turns a seal job into a motor job.

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