Model # 374A

Internet #100532582

Store SKU #816403

null 3/4 in. Cast-Iron Water Pressure Safety Relief Valve
0098268678833

3/4 in. Cast-Iron Water Pressure Safety Relief Valve

$24.78 /each

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Product Overview

The 3/4 in. Cast-Iron Water Pressure Safety relief valve is used in hot water boiler applications to protect against excessive pressure on all types of hot water heating boiler equipment. It consists of an iron body construction with forged bronze inlet connections, non-metallic disc-to-metal seating, stainless steel spring, and test lever. It resists corrosive water conditions, sticking and freezing, and prevents water and sediment from being trapped in the seat. It is designed for emergency safety relief and not as an operating control.

California residents: see   Proposition 65 information

  • Standard pressure setting 30 psi (206.9 kPa)
  • Pressure range in 5 psi (34.5 kPa) increments from 30 to 150 psi (2 to 10 bar) with corresponding high ratings at 550,000 BTU/Hr
  • Iron body for strength and long life
  • Easy to install

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Customer Questions & Answers

6 Questions6 Answers

Customer Questions & Answers

3/4 in. Cast-Iron Water Pressure Safety Relief Valve
3/4 in. Cast-Iron Water Pressure Safety Relief Valve

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2 answers

Can the valve get mounted horizontally?

This question is from 3/4 in. Cast-Iron Water Pressure Safety Relief Valve
Asked by
Rhode Island
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September 25, 2015
Can the 374 mount sideways to point down with the discharge?
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Asked by
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November 16, 2015
Answer: 
Yes. no problem there
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Asked by
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September 29, 2015
Answer: 
Per ASME Section IV the safety relief valve spindle should be installed in the vertical orientation.
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1 answer

May i use it heating sistems ? Boiler?

This question is from 3/4 in. Cast-Iron Water Pressure Safety Relief Valve
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December 8, 2015
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Answer (1)

January 21, 2016
Answer: 
Yes, this is for use with hot water boiler heating systems.
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1 answer

will this valve replace Conbraco 10-408-05

This question is from 3/4 in. Cast-Iron Water Pressure Safety Relief Valve
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Baltimore, Md
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March 2, 2015
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March 5, 2015
Answer: 
Yes, the ¾” 374A will replace the Conbraco 10-408-05.
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1 answer

The item says it cannot be shipped to Alaska. Is there a reason?

This question is from 3/4 in. Cast-Iron Water Pressure Safety Relief Valve
Asked by
Juneau, Alaska
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July 20, 2014
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Answer (1)

July 28, 2014
Answer: 
Thank you for your recent inquiry with The Home Depot. I believe the best advice would be to talk to one of our many specialty department professionals at your local Home Depot store. For any other questions, please visit your nearest local Home Depot store or call us at HomeDepot.com Customer Service 800-430-3376.
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Customer Reviews

3/4 in. Cast-Iron Water Pressure Safety Relief Valve is rated 4.1 out of 5 by 13.
Rated 4 out of 5 by from Does the job Only lasted 3 years, but for the price, its worth it. Thanks home depot for having it in stock.
Date published: 2017-01-03
Rated 5 out of 5 by from This relief valve is a good product at the cost. This relief valve is a good product at the cost.
Date published: 2017-01-06
Rated 1 out of 5 by from Broke after three days Broke after three days
Date published: 2016-12-27
Rated 5 out of 5 by from Does the job Although a little pricey for just a pressure valve, it does do the job.
Date published: 2013-09-01
Rated 3 out of 5 by from Should last longer I have to replace these every year or two because they start leaking. They don't wear out but the disc type valve seat gets contaminated too easily. Needs a better design.
Date published: 2015-01-06
Rated 5 out of 5 by from heating system only (30 psi relief) Simple to install after heating system drained. Two pipe wrenches and some white Teflon tape were the only things needed to complete the installation.
Date published: 2015-01-20
Rated 3 out of 5 by from Defective Product The product does work but I had to buy a second because the first one leaked worse that the old one. What I discovered after installing the second (worked fine) and inspecting the first valve was the brass threading process left a brass remnant the thickness of a hair that was stuck under the rubber washer causing it to leak. Poor QC.
Date published: 2015-08-29
Rated 4 out of 5 by from the new ones work well, but they do ot seem to last long. they leak after a few years. The valves seem to leak after only a few years. quality not as good as ones from years ago. not many other brand choices than watts so have to stick with it. unless home depot is selling a lower quality part than a similar watts part from a real plumbing supply house.
Date published: 2015-10-06
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