Interstate Pneumatics FPM44S-KH4 Aluminum Rectangular Manifold with Four 1/4 Inch Steel Industrial Couplers and One 1/4 Inch Steel Plug Kit Pre-assembled ready to go Professional grade couplers, designed for long life and problem free performance Steel plug is heat treated and recommended for heavy use Kit includes: CH441, CPH441 and FPM44S Max Working Pressure: 250 PSI