Pentair U212-252D brass 1/4 inch NPT air release valve for pool filtersPentair Air Release Valve, 1/4" NPT Brass, U212-252D$3699
Pentair U212-252D brass 1/4 inch NPT air release valve for pool filters

Pentair Air Release Valve, 1/4" NPT Brass, U212-252D

Ask a questionMPN U212-252D
$3699
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Quick overview

  • Brass, not plastic A machined brass valve body rather than a molded one.
  • Quarter inch NPT Threads into a 1/4" NPT port.
  • Bleeds trapped air Opening it lets air escape as the system primes, so the tank fills with water instead of holding an air pocket.
  • Fits HRPB sand filters Listed for the Sta-Rite HRPB high rate sand filters, models HRPB20, HRPB24 and HRPB30.
  • Fits HRP and DEPB filters Also listed for the HRP sand filters, models HRP 20, 24 and 30, and for the DEPB vertical DE filters.
  • Use it before opening the filter Always release pressure at this valve before undoing a filter clamp or lid, every time.
Full description and specifications ↓

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Product details

Pentair U212-252D is a brass air release valve with a 1/4 inch NPT thread, listed for the Sta-Rite HRPB high rate sand filters, the HRP sand filters and the DEPB vertical DE filters.

What it is for

Air gets into a filter tank every time the system is opened or loses prime. It gathers at the top, takes up space the water should occupy and drops the filter efficiency. The air release valve gives it somewhere to go: open the valve on start up, wait for a steady stream of water, and close it again.

A safety habit worth keeping

Use this valve to relieve pressure before you open a filter clamp or lid. A tank still under pressure can throw a lid, and that is the injury nobody expects. Opening the release valve first takes seconds.

Brass body

The valve body is brass rather than plastic, which is what you want on a part that gets handled and turned regularly through the season.

Specifications
Brand Pentair
Manufacturer part number U212-252D
UPC 788379783495
Type Air release valve
Part type Pool filter part
Material Brass
Thread 1/4" NPT
Fits Sta-Rite HRPB20, HRPB24, HRPB30 high rate sand filters
Also fits HRP 20, HRP 24, HRP 30 sand filters, Sta-Rite DEPB vertical DE filters
Shipping weight 0.1 lb
Ships Parcel

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Customer reviews

Questions and answers

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

What thread does it use?
1/4 inch NPT.
Which filters is it listed for?
The Sta-Rite HRPB high rate sand filters in models HRPB20, HRPB24 and HRPB30, the HRP sand filters in 20, 24 and 30, and the Sta-Rite DEPB vertical DE filters.
Why does my filter need an air release valve?
Air collects at the top of a filter tank as the system primes. Left there it cuts filtration and puts the tank under pressure it was not meant to hold, so the valve lets it out.
Is it brass or plastic?
Brass.
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