ASC Engineered Solutions 3/4X1/2 XH BLK MI REDUCER

Both ends are FPT (female pipe thread), so the reducing coupling threads onto male pipe ends or male fitting nipples on each side. The large end takes 3/4 inch, the small end 1/2 inch. Threads are cut to ASME B1.20.1, the standard NPT thread spec, so it mates with any standard NPT black or galvanized pipe nipple.

This 3/4 x 1/2 extra heavy black reducer is UL/FM rated, which is what an AHJ looks for on sprinkler piping. It is malleable iron to ASTM A-197 with dimensions and pressure ratings to ASME B16.3. Black iron is for dry systems and general non-potable service; it is not for potable water.

Yes, if the run is standard NPT threaded pipe. The fitting is dimensioned to ASME B16.3 and threaded to ASME B1.20.1, the same standards used for the nipples and fittings in a typical black iron assembly, so lay length and thread engagement match what is already in the line. You still need to break the run and rethread or add a union, since both ends are female and the fitting cannot swivel.

Black finish malleable iron, not galvanized. Black is the standard choice for natural gas and propane piping and for dry sprinkler and steam service. Where the spec calls for galvanized (wet or corrosive service, exposed exterior runs), a black fitting is the wrong finish.

This ASC part is a reducing coupling, female thread on both the 3/4 and the 1/2 side, so it joins two male pipe ends. A bushing is male on the large end and female on the small end and screws into a fitting port instead. If you are joining two lengths of pipe, you want this reducer; if you are reducing the outlet of a tee or valve, you want a bushing.

ASC Engineered Solutions part number 310541800. One configuration only, so there is no finish, size, or pattern option to specify beyond confirming you want the extra heavy (Class 300) version rather than standard weight.