The Mechanics M604C 5-Piece Coupler Set includes one coupler and four nipples, all 1/4-inch in size. Features: * 5-piece Coupler Set includes 1 female nipple, 1/4-inch female NPT coupler and three 1/4-inch male NPT nipples What"s In The Box: * 1/4-Inch Female NPT Coupler * Three 1/4-Inch Male NPT Nipples * 1/4-Inch Female NPT Nipple