Watts LFN55BM1 3/4 IN 3/4 In Lead Free Water Pressure Reducing Valve, Npt Female X Npt Female, Adjust 25-75 psi, Max Work 400 psi

Both ends of the LFN55B-M1 are 3/4 inch NPT female threaded, inlet and outlet. On copper you will need male adapters or threaded unions at each side; it does not solder or push-fit directly. On threaded steel or brass pipe it makes up direct.

Yes, it is a lead free valve built for potable service, with a brass body, bronze trim and a stainless steel strainer. The LF prefix in the model name is Watts' lead free designation.

The LFN55B-M1 has a built-in thermal expansion bypass, which relieves excess pressure back toward the supply side when the water heater heats up. That bypass handles thermal expansion in the piping, but it does not replace a properly sized expansion tank where local code requires one on a closed system. Check your inspector's requirement for the installation.

Maximum working pressure on the LFN55B-M1 is 400 psi (27.6 bar), so high street mains or a booster discharge is well within range. Temperature limits run from 33 F up to 180 F, which covers domestic cold water service and is not intended for steam or high-temperature applications.

An integral stainless steel strainer is built into the valve, so you do not need a separate strainer upstream to protect the seat from mains debris. Leave clearance at the strainer cap so it can be pulled and cleaned without unpiping the valve.

The disc is reinforced EPDM, which is the standard elastomer for potable cold water service. The body is brass with bronze trim and there is no added corrosion resistant coating, so it is the base metal doing the work, as is normal for a domestic water PRV.