Sta-Rite U43-21SS extended tooth lock washer for Sta-Rite and Pentair pumpsSta-Rite Extended Tooth Lock Washer, U43-21SS In stock$1499
Sta-Rite U43-21SS extended tooth lock washer for Sta-Rite and Pentair pumps
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Sta-Rite Extended Tooth Lock Washer, U43-21SS

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$1499
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Quick overview

  • Genuine Sta-Rite part Factory part number U43-21SS, not a hardware store substitute.
  • Extended tooth pattern The teeth reach out past the fastener face, which is what gives this style of washer its grip against loosening.
  • Sta-Rite pump coverage Listed for Dyna-Pro and Dyna-Pro E, Max-E-Pro, Max-E-Glas and Dura-Glas, Max-E-Glas II and Dura-Glas II, Dyna-Glas and Dyna-Max, and IntelliPro VS 3050.
  • Pentair pumps as well The same washer appears in the Pentair Pinnacle, Dyna-Wave and IntelliPro variable speed parts lists.
  • Worth replacing, not reusing A lock washer does its work by deforming, so one that has already been torqued down has spent most of its grip.
  • Check the breakdown first Your pump diagram shows where this washer sits and how many the assembly takes, which is worth confirming before you order.
Full description and specifications ↓

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Product details

The Sta-Rite U43-21SS is the extended tooth lock washer used through the Sta-Rite pump line. It is the genuine factory part, the one the manufacturer parts breakdowns call out by number.

Where it turns up

This washer is not tied to one pump. It is listed for the Dyna-Pro and Dyna-Pro E, Max-E-Pro, Max-E-Glas and Dura-Glas, Max-E-Glas II and Dura-Glas II, Dyna-Glas and Dyna-Max, and the IntelliPro VS 3050, and it carries across to Pentair as well, showing up in the Pinnacle, Dyna-Wave and IntelliPro variable speed parts lists.

Why bother replacing it

An extended tooth washer grips because its teeth deform against the fastener and the surface below. Once it has been torqued down and backed off, most of that spring is gone. Reusing one is a common shortcut and a common reason hardware works loose again a season later. If you have the pump apart, put fresh washers back in.

Before you order

Open the parts breakdown for your pump and confirm the position and the count. Several assemblies on the same pump can call for this washer, so it is easy to come up one short.

Specifications
Brand Sta-Rite
Manufacturer part number U43-21SS
UPC 788379786342
Type Extended tooth lock washer
Part type Pool pump part
Fits Sta-Rite Dyna-Pro and Dyna-Pro E, Max-E-Pro, Max-E-Glas and Dura-Glas, Max-E-Glas II and Dura-Glas II, Dyna-Glas and Dyna-Max, IntelliPro VS 3050
Also listed for Pentair Pinnacle, Pentair Dyna-Wave, IntelliPro variable speed
Shipping weight 0.01 lb
Ships Parcel

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Questions and answers

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

Is this the genuine Sta-Rite washer?
Yes. It is Sta-Rite part number U43-21SS, the washer called out in the factory parts breakdowns rather than a generic equivalent.
Which pumps use this washer?
It is listed for Sta-Rite Dyna-Pro and Dyna-Pro E, Max-E-Pro, Max-E-Glas and Dura-Glas, Max-E-Glas II and Dura-Glas II, Dyna-Glas and Dyna-Max, and IntelliPro VS 3050, plus the Pentair Pinnacle, Dyna-Wave and IntelliPro variable speed pumps.
Can I put the old washer back?
It is not worth it. A lock washer holds by deforming between the fastener and the surface under it, so once it has been tightened down it has already flattened. New washers are the cheap part of any pump rebuild.
How many do I need?
That depends on where you are working. Pull up the parts breakdown for your pump model and count the positions that call for this washer before you order.
Ask your own question