Watts 0275600 1 1/4 In Bronze Boiler Pressure Relief Valve, 30 psi, Threaded Female Connections

Both ends are 1-1/4 inch female NPT. Inlet and outlet are the same size, so it threads onto a 1-1/4 inch male NPT boiler tapping and takes a 1-1/4 inch male-threaded discharge pipe. No adapters are needed if your tapping is 1-1/4 inch; if the boiler tapping is a different size, use the valve that matches the tapping rather than bushing this one down.

No. The 174A is a boiler pressure relief valve, pressure protection only, and it carries a steam discharge rating rather than a water heater T and P rating. Domestic water heaters require a combination temperature and pressure relief valve with an extension thermostat probe. Use this one on hot water heating boilers.

The 0275600 has a steam discharge capacity of 1,682,000 BTU per hour. Size the relief valve so its capacity is equal to or greater than the gross BTU input stamped on the boiler nameplate. At 1,682,000 BTU/hr this covers large residential and commercial boilers. If your boiler input is higher than that figure, this valve is undersized for the appliance.

250 degrees F maximum. That covers normal hot water heating boiler operation, which typically runs well below the boiling point at system pressure. The body is bronze, so it holds up in hot water service without the corrosion problems of a ferrous body.

Yes, the 0275600 comes with a manual test lever, so a maintenance tech can lift and flush the seat during annual service without pulling the valve. That is what a boiler inspection expects to see on the valve, and it is the usual way to prove the disc is not stuck to the seat.

Yes. Run a discharge pipe from the 1-1/4 inch female NPT outlet, full size, with no reduction and no valve in the line, terminating near the floor so a discharge cannot scald anyone. The valve ships with the outlet only, the discharge piping is field supplied.

Match three things on the existing valve tag: the relief setting, the connection size, and the BTU capacity. This one is 30 psi, 1-1/4 inch female NPT both ends, 1,682,000 BTU/hr. If the boilers across your portfolio have the same tapping size but different nameplate pressures, the 174A family runs 30 through 150 psi, so you can standardize on the series and vary only the setting.

Yes, the 174A series 0275600 is manufactured in the United States, which matters for government, education, and healthcare procurement with domestic sourcing requirements on the spec.