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Manufacturer Resources
Product Specs
- Body Material:
- Iron
- Buy American Act Compliant:
- No
- Ean:
- 98268019629
- Inlet Connection Size:
- 2 IN
- Inlet Connection Type:
- Female Threaded
- Inlet Thread Type:
- NPT
- Lead Free:
- Not In Scope
- Maximum Temperature Fahrenheit:
- 250
- Maximum Working Pressure Psi:
- 20
- Outlet Connection Size:
- 2 1/2 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Part Number:
- 384042
- Pressure Range:
- 30 to 75 PSI
- Pressure Relief Setting Psi:
- 30
- Pressure Steam Discharge Capacity:
- 5,250,000 BTU per hour
- Protection Type:
- Pressure
- Series:
- 740
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
- Brand Name:
- Watts
Watts 740-030 2 – Frequently Asked Questions
1) What size pipe does the Watts 740-030 2 boiler relief valve thread into?
The inlet is 2 inch female NPT, so it threads onto a 2 inch male NPT nipple off the boiler tapping. The discharge side steps up to 2-1/2 inch female NPT, which is why it's called an expanded outlet. Plan your drain line for 2-1/2 inch pipe running full size to a safe point of discharge, not the 2 inch you used on the inlet.
2) Is the Watts 740 relief valve a pressure-only valve or a combination temperature and pressure valve?
Pressure only. There's no temperature probe on it, so it protects against overpressure and nothing else. If you're working on a water heater that needs a T and P valve with an extension element sensing tank temperature, this is the wrong part. On a heating boiler, a pressure-only relief valve is what the jurisdiction typically expects.
3) Can I use the Watts 740-030 2 on a potable water heater?
No. It's an iron-bodied heating boiler valve and it isn't within the lead-free scope that governs potable water components. Keep it on closed-loop hot water and low pressure steam heating systems. For domestic water heater protection you need a bronze T and P relief valve certified for potable use.
4) What temperature can the Watts 740 iron relief valve handle?
Maximum 250 degrees F. That covers hot water heating loops and low pressure steam service. The body is cast iron, so it's built for closed-loop heating systems rather than potable water.
5) Does the Watts 740-030 2 relief valve qualify for a Buy American job?
No. The 740-030 2 is not Buy American Act compliant, so it won't satisfy a federal or state contract carrying a domestic sourcing clause. Institutional and government buyers on a BAA-flagged spec should source a compliant relief valve instead.
6) What part number do I order to match a Watts 740-030 2 already installed?
Ask for Watts 740-030 2, the 2 inch iron boiler relief valve set at 30 psi with the expanded 2-1/2 inch outlet. Watts also catalogs it under part number 384042. The 30 psi setting and the inlet and outlet sizes are what have to match on a swap, since the existing drain piping is built around that 2-1/2 inch outlet.
How fast can I get the Watts 740-030 2 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 740-030 2 come with a warranty?
Absolutely. The Watts 740-030 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 740-030 2?
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