Description
The Pentair U109-93SS (also known as 5056-08) is the replacement shaft seal for pre-1998 Sta-Rite Dura-Glas and Max-E-Glas pool pumps. This 5/8-inch Buna rubber “old style” seal is designed for copper insert pump configurations.
What It Does
The shaft seal sits at the interface between the pump motor’s rotating shaft and the impeller. When this seal wears or fails, water can migrate past it and into the motor, causing accelerated corrosion and component damage. Replacing the shaft seal at the first sign of weeping or leakage at the pump shaft prevents consequential damage to the motor and surrounding pump components.
Specifications
| Pentair Part Number | U109-93SS |
| Size | 5/8″ shaft |
| Material | Buna rubber |
| Dimensions | 1.3″ Length, 1.2″ |
| Compatible Pump Style | Old style copper insert pumps (pre-1998) |
| Alternative Part Numbers | 5056-08, 004547, 351021030, PSR-100 |
Poolaroo Pro Tip
Before ordering, locate the part number stamped or molded on your existing seal and confirm it matches U109-93SS this seal fits pre-1998 copper insert pumps only and is not interchangeable with later Sta-Rite shaft seal designs. When replacing the shaft seal, inspect the O-ring on the pump volute at the same time; replacing both sealing components together eliminates a second service visit if the O-ring is nearing the end of its service life.
