Bk Mueller 520-331HC Black Iron Reducer Tee 1/2x1/4 Inch

Product Description

The BK MUELLER 520-331HC is a black malleable iron reducer tee fitting designed for threaded pipe connections in plumbing, gas distribution, and mechanical piping systems. It steps down from a 1/2-inch line to a 1/4-inch branch using female iron pipe (FIP) threads on all connections. Built to Class 150 standards with a 300 psi pressure rating, this fitting handles both liquid and gas service. The black finish indicates a non-galvanized iron construction suited for gas piping applications. Licensed plumbers and pipefitters are the primary installers, though the fitting also sees use in compressed air and hydronic distribution work.

This reducer tee is appropriate for residential and light commercial piping where a threaded branch takeoff with a size reduction is needed in a single fitting. Typical scenarios include natural gas supply lines, propane distribution, and low-pressure compressed air headers where a 1/2-inch run transitions to a 1/4-inch branch tap. The FIP thread standard provides compatibility with standard NPT-threaded pipe and nipples throughout North American trade supply chains.

Key Features

• Malleable iron construction provides durability and resistance to mechanical stress in threaded assemblies
• Black finish suited for gas piping applications where galvanized fittings are not appropriate
• 300 psi liquid and gas pressure rating supports a wide range of low- to medium-pressure service
• Class 150 classification meets standard trade and code requirements for threaded iron fittings
• FIP threads on all ports ensure compatibility with standard NPT-threaded pipe and fittings
• Tee body with reducer configuration eliminates the need for a separate bushing or coupling

Compatibility

Designed as an OEM-style replacement or new-installation fitting for threaded malleable iron piping systems using 1/2-inch and 1/4-inch NPT connections in gas, liquid, or compressed air service.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, IFGC requirements for gas piping, or IPC requirements for water and mechanical systems. Shut off and depressurize the line completely before removing or installing any threaded fitting. Apply an approved thread sealant or PTFE tape rated for the service medium to all male threads before assembly. Do not overtighten threaded connections, as malleable iron fittings can crack under excessive torque.