0098268678833

Model # 374A

Internet # 100532582

Store SKU # 816403

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

$24.78 /each

Frequently Bought Together

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

Info & Guides

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Specifications

Dimensions

Product Depth (in.) 
Product Height (in.) 
Product Length (in.) 
1.5 in 
Product Width (in.) 
2.5 
Valve Inlet Diameter (in.) 
.75 
Valve Outlet Diameter (in.) 
.75 

Details

Compatible Pipe Material 
Brass 
Connection 
FIP 
Indoor/Outdoor 
Indoor 
Material 
Cast Iron 
Maximum Pressure (psi) 
30 
Maximum Working Temperature (F) 
180 
Product Weight (lb.) 
1.14 lb 
Rating 
Water 
Returnable 
90-Day 

Warranty / Certifications

Manufacturer Warranty 
Watts (the "Company") warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment. 

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Customer Questions & Answers

5 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
Asked by
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

Rated 4.3 out of 5 by 10 reviewers.
Rated 5.0 out of 5.0 by Pressure Relief Valve I am very pleased with the purchase. Easy to install and seems to be working well. December 22, 2015
Rated 5.0 out of 5.0 by Perfect part Excellent replacement for my heater's aging T&P valve. December 15, 2015
Rated 4.0 out of 5.0 by 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. October 6, 2015
Rated 3.0 out of 5.0 by 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. August 29, 2015
Rated 3.0 out of 5.0 by safety relief valve Basic install and hopefully it does what it is suppose to March 10, 2015
Rated 5.0 out of 5.0 by 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. January 20, 2015
Rated 3.0 out of 5.0 by 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. January 6, 2015
Rated 5.0 out of 5.0 by Worked great My boiler relief valve was leaking and needed to be replaced due to corrosion. Home depot had one in stock and it was the exact one that was installed. July 8, 2014
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