Message to Our Customers
Discontinued

Watts

Model # 374A

Internet # 100532582

Store SKU # 816403

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

This item has been discontinued.
The Home Depot no longer carries this specific product.

$24.78 / each

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PRODUCT OVERVIEW

Model # 374A

Internet # 100532582

Store SKU # 816403

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. 

CUSTOMER REVIEWS

Rated 4.3 out of 5 by 6 reviewers.
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 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 Does the job Although a little pricey for just a pressure valve, it does do the job. September 1, 2013
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
Rated 5.0 out of 5.0 by Pressure relief valve The valve works and doesn't leak. I expected this. Reliability won't be determined in the immediate future. June 17, 2014
  • 2015-07-01T13:51:43.514-05:00
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SHIPPING AND DELIVERY OPTIONS

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If product is eligible for shipping to AK, HI and US Territories additional transit time and remote surcharges may apply.