ASC Engineered Solutions 11/2X1X1 BLK MI TEE

It's a reducing tee with three female threaded openings: 1-1/2 inch on the run and 1 inch on the other two ports. So the straight-through run carries 1-1/2 inch pipe and the branch takes 1 inch, with the remaining 1 inch port reducing off the run.

All three ends are FPT (female pipe thread) cut to ASME B1.20.1, which is the NPT standard. It threads directly onto any standard NPT male pipe nipple or threaded black steel pipe end in the matching sizes, with pipe dope or PTFE tape on the male threads.

Yes, the ASC Engineered Solutions 1-1/2 x 1 x 1 black tee carries UL/FM recognition, so it can be used on fire protection piping where a listed fitting is required. It's Class 150 standard pattern to ASME B16.3.

No. Black malleable iron is for gas, fire protection, air, and non-potable service. The black finish has no corrosion protection against water, so it will rust from the inside on a wet domestic line. For potable water use galvanized malleable iron, copper, or CPVC instead. Black iron is the standard choice for natural gas and propane distribution.

Standard weight (STD), which is Class 150 under ASME B16.3. That's the common weight for gas and fire piping. If your spec calls for extra heavy (Class 300), this is not the fitting for that job.

The casting is made to ASTM A-197 malleable iron, with dimensions and pressure rating to ASME B16.3. Those are the two specs a mechanical submittal usually asks for on a black iron threaded fitting.

No bushing needed for the 1 inch branch or the 1 inch reduced end, because the reduction is cast into the tee itself: the ports are 1-1/2, 1, and 1. Using a reducing tee instead of a full-size tee plus bushings saves two joints and keeps the assembly shorter, which matters in tight joist bays.

Manufacturer part number 310047600 from ASC Engineered Solutions, weighing 1.14 lbs each. Handy if you're calculating hanger loads or freight on a bulk order of black iron fittings.