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Product Specs
- Body Material:
- Lead Free Copper Silicon Alloy
- Brand Name:
- Watts
- Buy American Act Compliant:
- USA
- Ean:
- 98268585193
- Inlet Connection Size:
- 1/2 IN
- Inlet Connection Type:
- Male Threaded
- Inlet Thread Type:
- NPT
- Lead Free:
- Yes
- Maximum Temperature Fahrenheit:
- 210
- Maximum Working Pressure Psi:
- 113
- Outlet Connection Size:
- 1/2 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Part Number:
- 121443
- Pressure Range:
- 75 to 150 PSI
- Pressure Relief Setting Psi:
- 150
- Protection Type:
- Pressure
- Series:
- LF53L
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
Watts LF53L-150 1/2 – Frequently Asked Questions
1) What size and thread connections does the Watts LF53L-150 relief valve have?
The LF53L-150 has a 1/2 inch male NPT inlet and a 1/2 inch female NPT outlet. So it threads directly into a 1/2 inch female NPT tapping on the tank or line, and you can pipe the discharge away from the female outlet with 1/2 inch NPT pipe.
2) At what pressure does the Watts LF53L-150 open, and can it be adjusted?
It is factory set to relieve at 150 psi. The LF53L family covers a 75 to 150 PSI range, so the 150 psi setting is the top of that range; if your system needs to dump earlier, you want a lower-set model in the same series rather than trying to re-rate this one.
3) Why does this Watts valve say 150 psi relief but 113 psi maximum working pressure?
Those are two different numbers. 113 psi is the highest continuous system pressure the valve should sit at, and 150 psi is the point where it lifts and relieves. Size your system so normal operating pressure stays at or below 113 psi, leaving headroom before the 150 psi set point.
4) Can I use the Watts LF53L-150 on a hot water line?
Yes, up to 210 degrees F. That covers domestic hot water and hydronic service. Note this is a pressure-only relief valve, not a temperature and pressure (T&P) valve, so it will not open on overtemperature. If code requires T&P protection on a water heater, this is not the valve for that duty.
5) Is the Watts LF53L-150 relief valve lead free for potable water?
It is a lead free valve with a lead free copper silicon alloy body, which is what a potable water installation calls for. The same alloy body also stands up to hot potable service up to 210 F.
6) Does this Watts relief valve have a test lever?
Yes, the LF53L-150 1/2 is the test lever version, so maintenance staff can manually lift the poppet to verify the valve is free and discharging rather than seized. That is the configuration most facilities standardize on for routine annual checks.
7) Is the Watts LF53L-150 acceptable on a Buy American job?
Yes. This relief valve is flagged Buy American Act compliant with USA origin, which is what government, education, and institutional specs usually ask for on plumbing trim.
How fast can I get the Watts LF53L-150 1/2 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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Need it urgently? Contact Us for expedited shipping options.
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 LF53L-150 1/2 come with a warranty?
Absolutely. The Watts LF53L-150 1/2 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 LF53L-150 1/2?
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