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Buying Guide: Galvanized and Black Iron Fittings

Galvanized Plugs, Bushings and Caps
Galvanized square head plugs come in sizes such as 1/4 in MPT and 3/8 in MPT. Galvanized hex bushings, such as 1/4 in MPT x 1/8 in MPT, are made from galvanized steel bar to reduce pipe size. The 1/4 in MPT x 1/8 in MPT galvanized hex bushing is suitable for oil, air and steam. Match the thread type and size on the fitting you are replacing before ordering.

Black Iron and Black Steel Fittings
Black iron fittings include malleable iron tees, reducing tees, couplings and plugs, such as the Anvil 3/4 in MPT plug. Black steel fittings include couplings and caps in 1/8 in FPT sizes. Check the fitting type and thread sizes against the old fitting, and have a qualified technician install gas fittings.

Frequently Asked Questions

What does Billco make?
Billco offers pipe fittings in galvanized and black iron or steel, including square head plugs, hex bushings, hex caps, couplings, tees and reducing tees. Some items carry the Anvil name. Use the part number to confirm the exact fitting you need.

How do I choose the right size or thread type?
Match the thread type and size on the old fitting. Fittings use MPT or FPT threads, and bushings have two sizes, such as 1/4 in MPT x 1/8 in MPT, so match both ends. Measure before ordering, and check the system or equipment manual for the correct pipe size.

What are these fittings used for?
Some galvanized square head plugs are for low pressure plumbing applications, including air, water, natural gas and steam. The 1/4 in MPT x 1/8 in MPT galvanized hex bushing is suitable for oil, air and steam, and the Anvil black malleable iron plug is for water and oil. Check your system or equipment manual, and have a qualified technician install gas fittings.