ASC Anvil 3/4" ground joint union is made of durable malleable iron with a black finish that resists rust. It features female iron pipe (FIP) connections on both ends and is rated for 150# pressure. National Pipe Threads ensure tighter seals than straight threads, meeting Fed. Spec. WW-P-471-B, ANSI B-16.14 (Dimensions), ANSI B-2.1 (Pipe Threads), Ferrous Plugs, Bushings, and Locknuts, Fed. Spec. WW-P-471-B, ANSI B-16.14 (Dimensions), ANSI B-2.1 (Pipe Threads), Malleable Iron Unions (Class 150), Fed. Spec. WW-U-531C, ANSI B-16.39.