This Campbell Hausfeld 7-Piece Air Tool Accessory Kit features a tubular-valve design that promotes high flow rates to help provide maximum performance. This kit includes 2 couplers with 1/4 in. (F) NPT, 2 plugs with 1/4 in. (F) NPT, 2 plugs with 1/4 in. (M) NPT and 1 connector 1/4 in. (M) NPT x 1/4 (F) NPT. Made of brass to ensure a long, durable life.