Model # 1/2 LF530C

Internet #205149183

Store SKU #1000321736

Watts 1/2 in. Lead Free Brass Pressure Relief Valve


1/2 in. Lead Free Brass Pressure Relief Valve

$3297 /each
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Product Overview

This 1/2 in. lead free calibrated pressure relief valve has an adjustable pressure relief range of 50 to 175 psi. It is designed for use as protection against excessive pressure build-up in systems containing water, oil, and air. It is an excellent choice for both contractors and homeowners.

California residents: see   Proposition 65 information

  • Lead free brass body construction
  • All stainless steel spring
  • Adjustable pressure range 50 to 175 psi
  • Maximum temperature 180°F

Info & Guides

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Name 3/4 in. Lead Free Brass NPT Pressure Relief Valve 1/2 in. Lead Free Brass Pressure Relief Valve 3/4 in. Brass Male Inlet x 3/4 in. Female Outlet FWC Adjustable Pressure Relief Valve
Brand Zurn-Wilkins Watts Cash Acme
Ratings (1) (9) (2)
Valve Outlet Diameter (in.) .75 .5 .75
Connection FIP Male Pipe Thread MIP x FIP
Valve Inlet Diameter (in.) .75 .5 .75
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Product Height (in.)
Product Length (in.)
Product Width (in.)
Valve Inlet Diameter (in.)
Valve Outlet Diameter (in.)


Compatible Pipe Material
Male Pipe Thread
Maximum Pressure (psi)
Maximum Working Temperature (F)
Product Weight (lb.)
Valve Type
Pressure Relief

Warranty / Certifications

Manufacturer Warranty
LIMITED WARRANTY: This Watts product has a Limited Warranty for a period of one year from date of original consumer retail purchase. For complete warranty details, ask retailer for copy

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Customer Questions & Answers

What is the pressure range

What is the pressure range
Asked by: Jake
The adjustable pressure range is from 50 to 175 psi.
Answered by: CommunityAnswer
Date published: 2017-07-26

Can this be use for a hot water heater?

I need 1/2 inch male end. Standard is 3/4
Asked by: CaptK
These valves are not ASME approved safety relief valves and should not be used in system applications with this requirement. Check your local codes to ensure that a safety relief valve is not required for your specific application.
Answered by: WattsWater
Date published: 2017-08-04

Mr. HOWMAN; you say there are better ways to deal with over pressure, could you explain please, b...

Mr. HOWMAN; you say there are better ways to deal with over pressure, could you explain please, because I need your advice. My home is in Los Angeles area and was build in 1962 and has galvanized piping. The water pressure is 136 PSI with the red arm of the gauge showing 150 PSI max. I have a little background in plumbing and want to change to PEX, so I need to reduce the pressure in a reliable way. I thought of installing a water tank with a float valve in the attic, but that drops the pressure too low. I can't rely on a regulator to keep the pressure safe for the plastic pipes all the time. I think 80 PSI is the maximum allowed for hot water PEX pipes. My regulator is not working and the relief valve next to it, downstream, which is set at 125 PSI is not opening so I have 136 PSI everywhere in the house. If I repair my regulator or buy a new one and replace my relief valve with this adjustable one would that be safe enough for the PEX plumbing which is all in the attic and if it leaks will do a lot of damage?
Asked by: KEN

Watts replacement

Will this replace a watts 53L relief valve?
Asked by: MUX
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Customer Reviews

1/2 in. Lead Free Brass Pressure Relief Valve is rated 3.8 out of 5 by 9.
Rated 5 out of 5 by from 5 Star Review Rating provided by a verified purchaser
Date published: 2017-04-22
Rated 1 out of 5 by from I've had 3 other Watts relief valves with the fixed 150 PSI and lever but those never lasted more... I've had 3 other Watts relief valves with the fixed 150 PSI and lever but those never lasted more than 2 years. I decided to try this model and it started leaking in 9 months. I call Watts to get it replaced under warranty but the Support rep gave me the run around and said I had to get my water pressure tested. After a dozen calls, I got a plummer out and he measured 94 PSI at the water meter in the home which is well below the 150 PSI set point. I called watts back and they still would not replace it. I'm now trying to find an alternate manufacturer. What a piece of junk!
Date published: 2016-12-03
Rated 4 out of 5 by from Item was a replacement for one we had been using for 12 years. Fit perfectly. Be sure to order th... Item was a replacement for one we had been using for 12 years. Fit perfectly. Be sure to order this product online and do not go into the store for the part. Price in the store is double the price that is Home Depot's online price.
Date published: 2017-01-30
Rated 5 out of 5 by from 1/2 in. Lead Free Brass Pressure Relief Valve Relief valve came a little slower than expected but it was exactly what I needed and the install is easy and adjusting is easy HD was very good on informing me when it was coming and when to come pick it up. Also when I showed up to pick it up they had it right there on the shelf so no waiting for employee to come and then go back to look for it. That is a huge plus!! Very happy with product and process of getting it. Would purchase again w/o hesitation.
Date published: 2016-09-06
Rated 5 out of 5 by from Good item, works very well Good item, works very well
Date published: 2017-01-10
Rated 4 out of 5 by from mis understood valve What most do not know about these is almost always if it starts dripping, it is probably doing what you want. This valve is intended for relieving excess water pressure from heat expansion that is caused when your water heater is heating up your water, and the more cold water it has to heat the more heat expansion you will have and the excess water pressure needs to go somewhere, and one way or another something is going to give, the relief vale releasing it or a bust water connector under a sink, and I have seen this it will for sure happen while you are gone over the weekend. My suggestion is if you don't like the dripping water coming from this valve then change it up a little and add a expansion tank above the water heater. this should fix your problem and shouldn't even need the relief valve here. But on another note .-- DO not remove or plug off the T&P valve ( temperature and pressure relief valve) this valve is a must and is set at a much higher setting then the other. If you are having one of these dripping, then you are having the same problem most likely and need to add a expansion tank at the water heater, and if you already have one and still having the problem it is probably still the same tank to do with as these do go bad or sometimes just need to add air pressure to the expansion tank. Always make sure it is sired right . up to a 50 gallon will use a small 2 gallon tank and above that you should use a 4.8 gal. Also if and when you install or change out a water heater you need to install a new expansion tank and I would recommend new water flexes.Gas water heaters do not do well with the braided supply lines, either use stainless steel non braided type or copper, and cannot hard pipe these anymore in a place that requires earth quake strapping U.P.C. codes call for flexible connections to allow a little movement. If you take my advise on these things you should have no issues. HOWMAN 69. plumbing contractor, in the trade for 31 years
Date published: 2016-02-17
Rated 1 out of 5 by from worst expansion valve I had my original valve (non adjustable) for 12 years and start leaking. I replaced with this valve by a professional that last 3 months before start leaking. I bought two from Home Depot and that too start leaking after about 2 months each. What a piece of junk.
Date published: 2016-02-12
Rated 4 out of 5 by from So far so good This is the third valve I am installing in a year. The previous ones (don't remember the brand, bought them in store) started dripping after a month or so, and once it starts leaking it just keeps increasing. This online product seems different. I have set it between 75 and 100 psi. I noticed it had leaked on several occasions, but then it stopped and dried out. This tells me the spring is doing its job, and the valve is responding normally to pressure spikes. So far, I am very satisfied with the purchase.
Date published: 2015-04-29
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