Sta-Rite U9-199 diffuser o-ring for the PLBC booster pumpSta-Rite Diffuser O-Ring for PLBC Booster Pump, U9-199 In stock$499
Sta-Rite U9-199 diffuser o-ring for the PLBC booster pump
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Sta-Rite Diffuser O-Ring for PLBC Booster Pump, U9-199

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$499
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Quick overview

  • Made for the PLBC The diffuser o-ring specified for the Sta-Rite PLBC booster pump, model PLBC-178L.
  • Seals the diffuser Keeps pressurized water from slipping back past the diffuser instead of going out to the cleaner.
  • Genuine Sta-Rite Part number U9-199, the factory o-ring for this position.
  • Fit it whenever the pump is open The diffuser is exposed during a seal change, so replacing this o-ring at the same time avoids a second teardown.
  • Restores cleaner pressure A booster pump that runs but no longer drives the cleaner hard is often leaking internally at this joint.
  • Small part on a hard working pump Booster pumps run hot and short cycle, and rubber at this joint hardens well before the pump itself wears out.
Full description and specifications ↓

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Product details

The Sta-Rite U9-199 is the diffuser o-ring for the PLBC booster pump, model PLBC-178L. It is the genuine Sta-Rite replacement for that position.

What it seals

A booster pump exists to give a pressure side cleaner more head than the filter pump can supply. The impeller does that work, and the diffuser directs the flow it produces. The o-ring between the diffuser and the housing is what stops pressurized water from circling back inside the pump. When it hardens or takes a set, the pump still runs and still sounds normal, but the cleaner gets less pressure than it should and starts to crawl.

Fitting

The diffuser is exposed as soon as the pump is opened, so this o-ring is worth changing during any PLBC service, particularly a shaft seal replacement. Seat it clean and dry into its groove and check the diffuser for cracks before you put the pump back together.

Specifications
Brand Sta-Rite
Manufacturer part number U9-199
UPC 788379774219
Type Diffuser o-ring
Part type Pool pump part
Fits Sta-Rite PLBC booster pumps, model PLBC-178L
Shipping weight 0.05 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

Which pump does this fit?
The Sta-Rite PLBC booster pump, model PLBC-178L.
What does the diffuser o-ring do?
It seals the diffuser against the housing. Without that seal, water the impeller has already pressurized leaks back inside the pump instead of being pushed out to the cleaner line.
Is this a genuine Sta-Rite part?
Yes. It is the Sta-Rite replacement, part number U9-199.
Should I replace anything else at the same time?
The shaft seal is the usual companion job, since both are reached with the same teardown. Inspect the diffuser itself for cracks while the pump is open.
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