Purex 71720 tapered valve rotor seal for SM and SMBW backwash valvesPurex Tapered Valve Rotor Seal, 71720 In stock$2699
Purex 71720 tapered valve rotor seal for SM and SMBW backwash valves
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Purex Tapered Valve Rotor Seal, 71720

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$2699
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Quick overview

  • Tapered rotor seal The seal that rides on the tapered valve rotor and keeps each port separated.
  • Purex and Pentair Purex branded part 71720, now under Pentair.
  • 2000 Series valves Listed for the SM and SMBW 2000 Series backwash valve family.
  • 4000 Series DE filters Also listed for the Purex 4000 Series molded DE filters, models 4024, 4036 and 4048.
  • Stops water going the wrong way A worn rotor seal lets water bypass between ports, which is what sends dirt back to the pool on filter.
  • Small part, whole valve Reseal the valve instead of replacing the whole assembly.
Full description and specifications ↓

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Product details

The Purex 71720 is the tapered valve rotor seal, listed for Pentair SM and SMBW 2000 Series backwash valves and for the Purex 4000 Series molded DE filters in models 4024, 4036 and 4048.

What it seals

Inside the valve, a tapered rotor turns to line up ports for filter, backwash and rinse. This seal is what keeps those ports separated as the rotor moves. When it hardens or wears down, water finds a path between ports it should never take, and the valve stops doing its job even though the handle still turns normally.

The symptom

Dirt coming back into the pool while the valve is set to filter is the classic sign of a bypassing rotor seal. So is water leaving the waste line when the valve is not on backwash. Both are seal problems rather than filter problems, and both are cheaper to fix than they look.

Specifications
Brand Purex (Pentair)
Manufacturer part number 71720
UPC 788379683238
Type Tapered valve rotor seal
Part type Filter valves part
Fits Pentair SM and SMBW 2000 Series backwash valves
Also fits Purex 4000 Series molded DE filters, models 4024, 4036, 4048
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.

What does the rotor seal do?
It seals against the tapered rotor inside the valve so each port stays separated. That separation is what makes the valve actually select filter, backwash or rinse instead of letting water take a shortcut.
Which valves and filters is it for?
Pentair SM and SMBW 2000 Series backwash valves, and the Purex 4000 Series molded DE filters, models 4024, 4036 and 4048.
Why is dirt coming back into my pool on filter?
A rotor seal that has hardened or worn lets water bypass between ports. Resealing the valve is the usual fix before anyone starts blaming the filter.
Is this a Purex or a Pentair part?
Both names apply. It carries the Purex brand and Purex is a Pentair line, so you will see part 71720 listed under either name.
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