POLARIS PUMP SEAL CERAMIC AND SPRING PB4SQ R0747800(DD1)

The Polaris PB4SQ Ceramic and Spring Mechanical Shaft Seal (Part #R0747800) is a genuine OEM internal pressure seal engineered to prevent water from leaking along the motor shaft of your booster pump. This heavy-duty assembly features a premium carbon-graphite ceramic mating ring and a corrosion-resistant stainless steel compression spring. Swapping a leaking or worn-out shaft seal is the single most critical step to prevent water from migrating backward into the motor housing and shorting out expensive internal windings or motor bearings.
Part Number: R0747800 (Cross-referenced: PS-3890, 60881)
Material: Ceramic, Stainless Steel Spring, Buna Rubber
Shaft Size: 5/8"Seal Head Type: Type D
Compatibility: Engineered exclusively for the multistage Polaris PB4SQ pressure booster pump (2017–current models).