Model # 1/2 LFN36M1

Internet #202922389

Store SKU #334355

Watts 1/2 in. Brass MPT Vacuum-Relief Valve
0098268571493

Watts

1/2 in. Brass MPT Vacuum-Relief Valve

$23.19 / each
If you buy 3 or more
$20.87 / each

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Product Overview

This lead free vacuum relief valve is suitable for low pressure steam and water service, and is ideal for use in domestic water heaters and supply tanks. This valve automatically allows air to enter into the piping system to prevent vacuum conditions that could siphon water from the system and damage water equipment. It features NPT male inlet connection, is low profile for easy installation, and has a protective cap.

California residents: see   Proposition 65 information

  • Lead-free brass construction to comply with lead-free installation requirements
  • Suitable for low pressure steam and water service
  • NPT threaded connection
  • Maximum working pressure is 200 psi

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Price
$23.19 /each
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Name 1/2 in. Brass MPT Vacuum-Relief Valve 3/4 in. Lead-Free Brass MPT Expansion Relief Valve 1/2 in. Lead-Free Brass SWT x SWT Tempering Valve
Brand Watts Watts
Ratings (8) (8) (9)
Valve Inlet Diameter (in.) .5 0.75 .5
Connection Male Pipe Thread Male Pipe Thread Sweat x Sweat
Valve Outlet Diameter (in.) .5 0.75 .5
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Customer Questions & Answers

is this needed in an rv? grey water lines,6gal

need to replace water heater in rv, 6gal, replacing the atwood rv with pt of use,110 only, 6gal.. into existing grey line cold/hot water lines. none was used in OM installation of water heater.? needed ?
Asked by: og2014
No you do not need one of these in the water system of an RV, you can accomplish the same function of this valve by opening a faucet when you drain the water tank or water heater when winterizing the system. that is not even necessary but it will allow it to drain faster
Answered by: RoyinWA
Date published: 2016-06-19

are these for use on a gas fired steam humidifier?

I installed one of these on a steam humidifier and it started to leak about a week after it was installed. I'm curious if I have a bad one or if I should have bought an O.E.M one. Thanks
Asked by: Patrick
The LFN36-M1 can be used on low pressure steam systems (up to 15-PSI) if installed using a pigtail fitting to prevent live steam from damaging the valve.
Answered by: WattsWater
Date published: 2016-04-12

can i use this to limit the max vacuum for a nash-elmo ind. d-97616 vacuum pump

Asked by: joebrown
Hi, This valve will open to atmosphere at less than .5” Hg vacuum. It has a capacity of 15 CFM. Please let us know if you have any other questions or concerns. Thank you.
Answered by: WattsWater
Date published: 2015-09-20
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Customer Reviews

1/2 in. Brass MPT Vacuum-Relief Valve is rated 3.1 out of 5 by 8.
Rated 5 out of 5 by from It is a needed Item on a close water system. In case of the water system of your town should malf... It is a needed Item on a close water system. In case of the water system of your town should malfunction your tank will not collapse. It is code on most applications.
Date published: 2017-03-23
Rated 3 out of 5 by from this is the second one i bought i thought it would last longer than the hot water tank i bought t... this is the second one i bought i thought it would last longer than the hot water tank i bought the first one six years ago
Date published: 2017-03-14
Rated 5 out of 5 by from Good product The product was what I thought it wold be, a relief valve for a water line
Date published: 2014-12-09
Rated 1 out of 5 by from Disapointment The valve leaked in at least 2 years after installation.
Date published: 2015-12-08
Rated 1 out of 5 by from Worst ever I bought 2 because I know it won't last more than 6 months. When one starts leaking I change it and sand the nicks out of the brass seat so I can get one more life out of it.
Date published: 2015-05-13
Rated 4 out of 5 by from Low cost alternitive Used this valve to replace the 95.00 vacuum relief valve on my swimming pool solar heating system on the roof. The purpose of this valve is to eliminate the possibility of the the system collapsing when the water drains from all the tubing by allowing air into the system, these work just as well as the far more expensive valves at the pool supply houses.
Date published: 2014-07-22
Rated 1 out of 5 by from GOOD PRICE A LEAK OCCURRED WITH IN TWO YEARS OF INSTALL AND DAMAGED THE TOP OF THE TANK, THE LEAK WAS BECAUSE THE VALVE WAS NOT SEALING INTERNALLY.
Date published: 2014-02-06
Rated 5 out of 5 by from worked great works great! and it is easy to install.fits perfect
Date published: 2013-12-10
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