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
Shop all Sta-Rite

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

Ask a questionMPN U212-252D
$3699
Out of stock
Get volume pricing Request a quote

30 day returns · Easy, with prepaid labels provided

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 ↓

Need a hand?

Bilingual support from pool professionals.
(888) 751-8084CallChat with a techChatEmail usEmail

Send us a message

A pool professional will get back to you, usually the same business day.

About Pentair Air Release Valve, 1/4" NPT Brass, U212-252D, SKU SWQ-051-4729. We will include it with your message.

We use your details to answer this message and nothing else.

Frequently bought together

Current item Pentair Air Release Valve, 1/4" NPT Brass, U212-252D
Sta-Rite

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

$3699
Sta-Rite 170145 System 3 S7M120 Large and Small Cartridge Set, 25021-0200S and 25022-0201S
Pentair

Sta-Rite 170145 System 3 S7M120 Large and Small Cartridge Set, 25021-0200S and 25022-0201S

$46499
Pentair 6-Position Top Mount Clamp Valve Top Assembly, 272568Z
Pentair

6-Position Top Mount Clamp Valve Top Assembly, 272568Z

$15199
Filbur Sta-Rite S7D75 Full Filter Grid Set (11 Grids), FS-3037
Unicel Filter Cartridges

Filbur Sta-Rite S7D75 Full Filter Grid Set (11 Grids), FS-3037

$24599
Pentair Genuine OEM Valve Body O-Ring for Cristal-Flo II and Sand Dollar Filters, 272541
Pentair

Genuine OEM Valve Body O-Ring for Cristal-Flo II and Sand Dollar Filters, 272541

$1199
Sta-Rite 150/200 Sq Ft Posi-Clear RP Replacement Lid, 12.5 in., 178745Z
Pentair

Sta-Rite 150/200 Sq Ft Posi-Clear RP Replacement Lid, 12.5 in., 178745Z

$15499
Pentair Genuine OEM Sand Filter Drain Cap, 154712
Pentair

Genuine OEM Sand Filter Drain Cap, 154712

$3399
Subtotal

Similar products

Other products people compare with this one.

Pentair 172855 genuine OEM strainer air vent, 3/4 inch air relief screen Pentair Genuine OEM Strainer Air Vent, 172855$2899 Pentair WC8-126Z air bleed filter Pentair Air Bleed Filter, WC8-126Z$2299 Pentair 98209803 manual air relief valve assembly for pool filters Pentair Manual Air Relief Assembly, 98209803$3199 Pentair 190092 9.5 inch internal air bleed assembly for FNS Plus DE filter Pentair 9.5 inch Internal Air Bleed Assembly for FNS Plus DE Filter, 190092$3399 Pentair Air Bleed Tube Assembly 320 Sq Ft | 170029 Pentair Air Bleed Tube Assembly 320 Sq Ft | 170029$5099 Pentair Multiport Side Mount Valve Handle 1.5 and 2 inch | 14971-SM10E1 Pentair Multiport Side Mount Valve Handle 1.5 and 2 inch | 14971-SM10E1$5099 Hayward DEX2400CR auto air relief assembly for Pro-Grid and Micro-Clear DE filters Hayward Auto Air Relief Assembly, DEX2400CR$3399 Pentair 195008 genuine OEM FNS tank o-ring for FNS D.E. filters Pentair Genuine OEM FNS Tank O-Ring, 195008$4499 Pentair 178575Z bottom bulkhead for Quad D.E. and FNS Plus filters Pentair Bottom Bulkhead for Quad DE and FNS Plus Filters, 178575Z$3199 Pentair Purex 073270Z eight hole DE filter manifold Pentair Purex 8 Hole Manifold (OEM), 073270Z$3799
Sta-Rite 23900-0039 brass tie rod for System 3 D.E. filters Sta-Rite Brass Tie Rod, 23900-0039$5499 Pentair 194989Z machined metal nut for PacFab Nautilus DE filters Pentair Nut Machined, 194989Z$1999 Pentair 194997Z machined clamp nut for FNS, INS and Quad DE filters Pentair Genuine OEM Machined Nut, 194997Z$1899 Pentair 35402-0074Z 1/4 inch-20 wing nut for Sta-Rite DE series filters Pentair Wing Nut 1/4"-20 DES Series, 35402-0074Z$1999 Paramount 005-302-0100-00 water valve base o-ring Paramount Water Valve Base O-Ring, 005-302-0100-00$2499 Hayward SPX0727E Perflex valve union nut in black Hayward Perflex Valve Union Nut SPX0727E$2699 Pentair 154747 spacer washer for PacFab Nautilus DE filters Pentair 154747 Genuine OEM Spacer Washer$2099 Pentair 59002100 tie rod, 1/4 inch by 27-1/2 inch, for 48 square foot DE filters Pentair Tie Rod 1/4" x 27-1/2" for 48 Sqft DE Filter, 59002100$4999 Pentair 174704 tank o-ring, 12-1/32 in. diameter Pentair Genuine OEM Tank O-Ring, 12-1/32" Diameter, 174704$3199 Pentair 195830 2 inch all purpose plug with o-ring for the FNS24 D.E. filter Pentair 2" FNS24 All Purpose Plug with O-Ring, 195830$2099

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

Request a quote

Need a volume price, a freight quote, or pricing in writing before you order? We reply the same business day.

Request a quote

Customer reviews

More from Sta-Rite

Pentair 170145 cartridge pack for Sta-Rite System 3 S7M120, inner and outer cartridges Sta-Rite 170145 System 3 S7M120 Large and Small Cartridge Set, 25021-0200S and 25022-0201S$46499 Pentair 461105Z MasterTemp and Max-E-Therm six button control board kit Pentair Genuine OEM MasterTemp/Max-E-Therm 6-Button Control Board Kit, 461105Z$53899 Pentair 272568Z six position top mount clamp valve top assembly Pentair 6-Position Top Mount Clamp Valve Top Assembly, 272568Z$15199 Filbur FS-3037 full 11 grid set for the Sta-Rite System 3 S7D75 DE filter Filbur Sta-Rite S7D75 Full Filter Grid Set (11 Grids), FS-3037$24599 Sta-Rite 08428-0125 SwimQuip white inlet face plate and eyeball kit with screws Sta-Rite Face Plate Inlet Eyeball Kit with Screws, 08428-0125$3499 Sta-Rite 17307-0110S pump tank body assembly for IntelliPro and Max-E-Pro pumps Sta-Rite Pump Tank Body Housing Assembly, IntelliPro, 17307-0110S$30499 Sta-Rite 27002-0300S 300 square foot MOD media replacement filter module for the PLM300 Sta-Rite 300 Sq. Ft. Filter Replacement MOD Media, 27002-0300S$56999 Pentair 170147 large and small cartridge filter pack for the Sta-Rite System:3 S8M150 Pentair Sta-Rite S8M150 Large and Small Cartridge Filter Pack 25021-0202S & 25022-0203S, 170147$76799 Sta-Rite 27001-0020S System 2 black upper tank shell half Sta-Rite System 2 Tank Shell Upper Half, Black, 27001-0020S$28799 Sta-Rite 77707-0054 Max-E-Therm igniter with gasket kit Sta-Rite Max-E-Therm Igniter with Gasket Kit, 77707-0054$9499
Sta-Rite 178745Z 12.5 in. Posi-Clear RP replacement filter lid, top view Sta-Rite 150/200 Sq Ft Posi-Clear RP Replacement Lid, 12.5 in., 178745Z$15499 Sta-Rite C176-59PZ tank body assembly for Max-E-Glas II and Dura-Glas II pumps Sta-Rite Tank Body Assembly for Max-E-Glas II and Dura-Glas II, C176-59PZ$29699 Pentair 474957 combustion chamber assembly for Sta-Rite Max-E-Therm heaters Pentair Combustion Chamber Assembly for Max-E-Therm Heaters, 474957$37399 Pentair Sta-Rite 474061 cupro nickel tube sheet coil assembly kit for MasterTemp 400NA and 400LP Sta-Rite Tube Sheet Coil Assembly Kit for Model 400NA, 400LP MasterTemp Heater, 474061$1,22199 Sta-Rite C103-194PZ Max-E-Pro pump seal plate, front view Sta-Rite Max-E-Pro Seal Plate, C103-194PZ$7099 Sta-Rite 24850-0105 air relief valve and pressure gauge assembly for System 3 filters Sta-Rite Valve and Gauge Assembly for System 3 Filters, 24850-0105$11099 Pentair 08650-0022 hinged weir door assembly for Sta-Rite and SwimQuip U-3 skimmers Pentair Weir Assembly for Sta-Rite U-3 Skimmer, 08650-0022$3899 Pentair 154712 sand filter drain cap Pentair Genuine OEM Sand Filter Drain Cap, 154712$3399 Pentair 356893Z IntelliPro VSF drive kit with keypad, black Pentair IntelliPro VSF Drive Kit with Keypad, Black, 356893Z$1,22699 Sta-Rite 42001-0061S air flow switch for Max-E-Therm SR200, SR333 and SR400 heaters Sta-Rite Max-E-Therm Air Flow Switch, 42001-0061S$15799

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.
Ask your own question