5 piece, 1/4" npt, m-style coupler & plug kit, basic flow size, all 1/4" body size air fittings, 1/4" npt, buna-n seals, couplers for air shop use, kwik change interchangeable/compatible with most manufacturers, maximum 40 scfm, 300 psi, temperatures up to 250 degrees fahrenheit, durable brass couplers, case-hardened steel plugs, plated to resist rust & corrosion, kit includes: 1 female coupler, 3 male plugs & 1 female plug.