Quantity: One Piece Main Collapsible Tank: Milled aluminum body with nickel plated steel quick connects for durability and a leak free fit. Couplers and Plugs: Copper and iron core connectors are steel nickel plated with anodized aluminum sleeves. Steel plugs are heat treated to reduce wear on critical mating surfaces.It also allows you to connect to different types of connections without changing tools and pipes. You can also use 3 different tools at the same time. Threading: 1/4 F-NPT, size: 120 x 20 mm / 4.72 x 0.79 inch. Simple Operation - Pneumatic manifolds can simply screw pneumatic fittings into ports on the distribution block to create an organized method of feeding multiple lines from one source.