ASC Engineered Solutions 3/8 XH BLK MI 90 ELL

Both openings are 3/8 inch female pipe thread, cut to ASME B1.20.1 (NPT). That means it threads directly onto standard 3/8 inch black steel or malleable iron pipe with NPT male ends, with thread sealant or tape. It is a female-by-female fitting, so you cannot thread it into a female port without a nipple.

XH is extra heavy, a thicker-wall class carrying a higher pressure rating than the standard 150 class fitting of the same size. On the ASC 3/8 black elbow, the pressure rating and dimensions both follow ASME B16.3, which is the standard that defines the 150 and 300 class malleable iron fittings. Reach for extra heavy when the spec on the drawing calls for a 300 class fitting or the line pressure exceeds what standard weight covers; for ordinary low pressure black iron gas or air runs, standard weight is the usual choice.

Yes, the 3/8 extra heavy black malleable iron 90 is UL/FM. That matters if your fitting schedule for a sprinkler or fire protection line requires listed and approved components, since an unlisted fitting will get flagged on inspection.

The finish here is black, not galvanized, and black malleable iron is the normal choice for natural gas, propane, compressed air, and fire protection piping. For potable or open water service the black finish will rust; specify a galvanized fitting of the same pattern instead. The material itself is malleable iron to ASTM A-197.

Order it as ASC Engineered Solutions part 310500400. It is a single configuration: 3/8 inch on both ends, extra heavy, black finish, 90 degree pattern.