ASC Engineered Solutions 1/2X3/8 GALV MI 90 ELL

Both openings are female pipe thread (FPT), so it takes male threaded pipe or nipples on each side. Threads are cut to ASME B1.20.1, the NPT standard, so it mates with standard NPT male pipe ends. It is a reducing elbow: 1/2 inch on the large end, 3/8 inch on the small end.

It carries UL/FM approval, which is what an inspector looks for on sprinkler piping fittings. It is standard pattern (STD) malleable iron to ASTM A-197 with pressure rating per ASME B16.3. Confirm the pressure class on the drawing matches a standard class fitting before you install.

Galvanized malleable iron is a steel-pipe fitting. The zinc coating is applied to ASTM A-153, which gives it corrosion resistance for water and general plumbing service on galvanized steel pipe. Use it with galvanized steel pipe, not with copper or PEX, and avoid running it directly against copper without a dielectric union to prevent galvanic corrosion.

Dimensions follow ASME B16.3, the standard for threaded malleable iron fittings, so the center-to-end takeout matches any other B16.3 fitting of the same size. That means you can figure your pipe cuts off standard tables and swap it in for another brand's 1/2 x 3/8 standard pattern elbow.

Order manufacturer part number 311007405 from ASC Engineered Solutions. It is the 1/2 x 3/8 galvanized malleable iron 90 degree reducing elbow, standard pattern, and it weighs 0.22 lbs each.

It is a 1/2 x 3/8 reducing elbow, so one female opening takes 1/2 inch male NPT and the other takes 3/8 inch. Convention in fitting callouts lists the larger size first. If you are stubbing down from a 1/2 inch branch to a 3/8 inch supply, this is the fitting that makes the turn and the reduction together.