ASC Engineered Solutions 1/2 BLK MI WYE

All three openings are female pipe thread (FPT), each in 1/2 inch, cut to ASME B1.20.1 NPT threads. So it takes three 1/2 inch male-threaded pipe nipples or male-end fittings, no welding or soldering. Thread sealant or PTFE tape on the male ends is standard practice.

No. Black malleable iron fittings are for gas, fire protection, air, and non-potable service. The black finish here is a mill/oil coating, not a corrosion barrier for wet potable lines, and black iron isn't used for drinking water. For potable work use galvanized, copper, brass, or PEX/CPVC instead.

Yes. Dimensions and pressure rating both conform to ASME B16.3, the material is ASTM A-197 malleable iron, and threads follow ASME B1.20.1. Those are the three callouts most mechanical specs and submittals ask for on black iron threaded fittings, so it'll drop straight into a B16.3 standard-class submittal package.

Straight 1/2 inch all around. Size 1, Size 2 and Size 3 are each 0.5 inch, so the branch is the same bore as the run. If you need to step down on the branch you'd add a bushing or a reducing coupling at that port.

A wye brings the branch in at an angle rather than at 90 degrees, so flow turns gradually instead of hitting a square shoulder. That means less turbulence and pressure drop where two streams merge or split, which matters on drainage, air, and pumped lines. If you just need a perpendicular takeoff and flow direction isn't a concern, a standard 1/2 inch black malleable tee is the cheaper and more common choice.

Manufacturer part number 310066600 from ASC Engineered Solutions, weight 0.37 lbs each. Handy if you're pricing a bulk box or figuring hanger loads on a run with several branches.

The fitting ships on its own, one 1/2 inch wye body with three female threaded ports. Pipe dope or PTFE tape, nipples, and any adapters are separate line items you'll need to add to complete the connection.