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Manufacturer Resources
Product Specs
- Body Material:
- Lead Free Brass
- Buy American Act Compliant:
- No
- Inlet Connection Size:
- 3/4 IN
- Inlet Connection Type:
- Male Threaded
- Lead Free:
- Yes
- Maximum Temperature Fahrenheit:
- 250
- Maximum Working Pressure Psi:
- 15
- Protection Type:
- Pressure
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
- Brand Name:
- Watts
Watts LFN36M1 3/4 – Frequently Asked Questions
1) What size and type of connection does the Watts LFN36M1 vacuum relief valve have?
It threads in through a 3/4 inch male NPT inlet, so it screws directly into a 3/4 inch female tapping on a tank fitting, tee, or nipple. No union or adapter is supplied, so if the opening you are landing on is male, you will need a coupling or female tee to receive it.
2) Can I use this Watts vacuum relief valve on a potable water heater?
Yes. The LFN36M1 has a lead free brass body and is flagged lead free, which is what a potable hot water installation requires. The temperature ceiling is 250 F, above normal domestic hot water operating temperature.
3) Does a vacuum relief valve do the same job as a T and P relief valve?
No, and one does not substitute for the other. A T and P valve dumps water when pressure or temperature climbs too high. A vacuum relief valve like the LFN36M1 does the opposite job, admitting air when the line goes to negative pressure so a tank cannot be siphoned down or collapsed when supply is lost or a lower draw-off opens. A water heater installation typically needs both.
4) Is the Watts LFN36M1 Buy American Act compliant for a government job?
No. The LFN36M1 3/4 is listed as not Buy American Act compliant, so on a federal or BAA-restricted specification you will need a compliant alternate.
5) Does the Watts LFN36M1 come with a cap over the air inlet?
It ships with a protective cap over the opening, which keeps dust and debris out of the air port while still letting the valve draw air. Mount it upright, above the tank, so the cap stays clear.
How fast can I get the Watts LFN36M1 3/4 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
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 LFN36M1 3/4 come with a warranty?
Absolutely. The Watts LFN36M1 3/4 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 LFN36M1 3/4?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Watts LFN36M1 3/4 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.