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3/4 In Lead Free Boiler Pressure Relief Valve, 100 psi, Threaded Female Connections
0121475 - spec sheet
0121475 - spec sheet
Manufacturer Resources
Product Specs
- Application:
- Boiler
- Body Material:
- Lead Free Copper Silicon Alloy
- Country Of Origin:
- United States
- Inlet Connection Size:
- 3/4 IN
- Inlet Connection Type:
- Female Threaded
- Inlet Thread Type:
- NPT
- Maximum Temperature:
- 250°F
- Maximum Working Pressure:
- 75
- Outlet Connection Size:
- 3/4 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Pressure Range:
- 50 to 150 PSI
- Pressure Relief Setting:
- 100 PSI
- Pressure Steam Discharge Capacity:
- 1,695,000 BTU per hour at 100 PSI
- Protection Type:
- Pressure
- Series:
- LF174A
- Test Lever:
- Yes
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
Watts 121475 – Frequently Asked Questions
1) What pipe size and connection does the Watts LF174A 0121475 relief valve use?
Both ends are 3/4 inch female NPT threaded, inlet and outlet. You thread it into a 3/4 inch NPT boiler tapping and run 3/4 inch threaded discharge pipe off the outlet. No sweat or union adapter is included, so if you are tying into copper you will need male adapters on both sides.
2) Can I use this Watts relief valve on a domestic hot water heater?
No. The LF174A 0121475 is a boiler pressure relief valve, pressure protection only, with no temperature relief element. Water heaters require a combination temperature and pressure (T and P) valve that trips at 210F. Use this on a hot water or steam heating boiler where an ASME-listed pressure-only device is what the job calls for.
3) Is the Watts 0121475 lead free for potable water piping?
The body is a lead free copper silicon alloy, so it is suited to systems where lead free construction is required. Note that this is the LF version of the 174A; the standard bronze 174A is not lead free.
4) What temperature can this Watts boiler relief valve handle?
Rated to 250F maximum, which covers normal hydronic supply temperatures and low pressure steam service. Mount it in the vertical, upright position on the boiler tapping, with the discharge piped full size to within a few inches of the floor.
5) Does the Watts 0121475 have a test lever for annual inspection?
Yes, it comes with a manual test lever. Maintenance crews can lift it to verify the valve is free and flushing, which is the standard annual check on a boiler safety device. No separate accessory to order.
6) Where is the Watts LF174A relief valve made?
Made in the United States, which matters on public and institutional work carrying domestic-sourcing requirements on the specification.
How fast can I get the Watts 121475 delivered?
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Watts 121475 come with a warranty?
Absolutely. The Watts 121475 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Watts 121475?
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