ASC Engineered Solutions 1X3/4X1 XH BLK MI TEE

It's a reducing tee: the two run ends are 1 inch and the branch outlet is 3/4 inch. All three openings are female pipe thread (FPT), so it threads onto male NPT pipe ends or male-thread nipples on every port.

Yes. The threads are cut to ASME B1.20.1, the NPT taper pipe thread standard, so it makes up directly on standard threaded black or galvanized steel pipe of matching size with pipe dope or PTFE tape. No adapter is needed for 1 inch runs and a 3/4 inch branch.

It carries UL/FM approval, which is what an AHJ and a sprinkler contractor look for on fitting submittals. The extra heavy class and the ASME B16.3 dimensional and pressure basis suit it to threaded sprinkler and standpipe branch work. Confirm the class matches what the sprinkler drawings call out for your system pressure.

No, not for potable water. Black malleable iron has no protective coating and will rust in wet service. The black finish and malleable iron body are meant for gas, steam, compressed air, fire protection and similar dry or oil-bearing service. For potable water on threaded steel, use galvanized fittings, or copper, CPVC or PEX.

XH is extra heavy, a heavier wall and higher pressure class than the standard 150 class malleable fitting. Both classes are covered by ASME B16.3, which sets the pressure ratings and the fitting dimensions. Use extra heavy where the system pressure or mechanical abuse calls for it, such as steam and heavier process or compressed air lines; standard class is fine on ordinary low pressure water and gas branches.

The casting is malleable iron to ASTM A-197, with dimensions and pressure rating per ASME B16.3 and threads per ASME B1.20.1. Those three lines are usually all a mechanical submittal or MRO spec sheet needs for a threaded malleable fitting.

1.38 lbs each. Worth knowing when you're counting hanger spacing and load on a threaded run, or figuring freight on a case quantity for a jobsite order.