Sta-Rite L1-25P21 diffuser for CK pumpSta-Rite Diffuser for CK Pump, L1-25P21$4599
Sta-Rite L1-25P21 diffuser for CK pump
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Sta-Rite Diffuser for CK Pump, L1-25P21

Ask a questionMPN L1-25P21
$4599
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Quick overview

  • For Sta-Rite CK pumps Sta-Rite lists it in the CK pump parts group.
  • Directs impeller flow The diffuser channels water leaving the impeller into the volute so the pump makes pressure instead of churning.
  • Fits around the impeller It seats over the impeller and locates it inside the housing.
  • Genuine Sta-Rite Factory part L1-25P21.
  • Watch for cracks A cracked or worn diffuser lets water short circuit back to the suction side and the pump loses flow.
  • Change it with the seal Since the pump is already open, this is the moment to look at the shaft seal and gaskets.
Full description and specifications ↓

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Product details

The Sta-Rite L1-25P21 is the diffuser for the CK series pool pump. It is the genuine Sta-Rite part.

What the diffuser does

The diffuser sits over the impeller inside the pump housing. Water thrown off the impeller has speed but little pressure until the diffuser channels it, and that conversion is what gives the pump its head. It also seals the high pressure side of the impeller from the suction side.

When to change it

A diffuser that has cracked, worn open at the impeller eye, or lost its seat lets water loop back inside the pump. The pump sounds fine but moves noticeably less water. Because the pump has to come apart to reach the diffuser, check the shaft seal and gaskets at the same time.

From Pool School

How to Prime a Pool PumpFrom the breaker to a full pot, each manufacturer's time limit, and what to check when it won't catch prime. Read Replace the Pool Pump Motor or the Whole Pump?The manufacturers' tests first, what each repair replaces, and the federal motor rule. Read
Specifications
Brand Sta-Rite
Manufacturer part number L1-25P21
UPC 788379739720
Type Diffuser
Part category Pool pump part
Fits Sta-Rite CK pump
Shipping weight 0.3 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 CK pump. It is listed in the CK pump parts group.
What does a diffuser do?
It surrounds the impeller and channels the water leaving it into the pump housing. That is what turns impeller speed into usable pressure and flow.
How do I know mine is bad?
A diffuser that is cracked, worn at the impeller opening, or no longer seating lets water recirculate inside the pump, and the symptom is a pump that runs normally but moves less water than it used to.
Does it come with a gasket or seal?
This listing is the diffuser. Inspect the shaft seal and gaskets while the pump is apart, since you have already done the work to get in there.
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