Few parts carry as many aliases as the Sta-Rite shaft seal commonly listed as U9-358. Depending on which catalogue, distributor or era you're reading, the same physical seal appears as:
- U9-358 — the number most people know
- U109-358SS — stainless variant designation
- U109-372SS
- 37407-0009
- 37400-0027S
- 17351-0101S
If you have been searching one of the less common numbers and finding nothing, that is why. They cross-reference.
Which pumps use it
Max-E-Pro
Max-E-Pro Rebuild Kit — lid o-ring U9-375 or 35505-1440, seal plate o-ring U9-228A, drain plug o-rings (2), union o-rings (2) U9-362, diffuser o-ring U9-374, impeller o-ring 35505-1426, shaft seal, lube.
Dyna series
Dyna Series Rebuild Kit — seal plate o-ring U9-373, drain plug o-rings (2) 192115, impeller gasket 33455-1047, lid o-ring U9-375 / 35505-1440, union o-rings (2) U9-362, diffuser o-ring U9-374, shaft seal, lube.
Dura-Glas II and Maxi-Glas II, P4E and P4EA
Dura-Glas II / Maxi-Glas II Rebuild Kit — lid o-ring U9-375, seal plate o-ring U9-228A, drain plug o-rings (2), insert o-ring U9-376 (pre-1998), diffuser o-ring U9-374, impeller o-ring 35505-1426, shaft seal, lube.
Not the same as the 354545 family
Pentair's other common shaft seal, 354545 (also 354545S, 17304-0100), fits the Challenger, SuperFlo, SuperMax, VS, Pinnacle, Dynamite, Dynamo, Dynatron and Triton. It is a different seal. The two families are not interchangeable, and the naming gives you no help distinguishing them — work from your pump model, not from the part number you half-remember.
Before you reassemble
Every o-ring in these kits seats better and lasts longer with a food-grade silicone lubricant. Dry o-rings pinch, twist and take a set, which is how a brand-new seal starts weeping within a season.
Aqua Flex Food Grade Silicone Lubricant is what ships in our kits. Apply it to o-rings only — never to the polished faces of a mechanical shaft seal. Lubricant on the carbon or ceramic makes the seal slip, overheat and leak.
Beaver Island Parts Company is not affiliated with, endorsed by, or sponsored by any equipment manufacturer named on this page. All brand names, model numbers and part numbers are the property of their respective owners and are used solely to identify the equipment our replacement parts fit.