Teryair manufacturers a range of PneumaticLine couplers in Brass, Stainless Steel and Steel Fluids such as compressed air and water are compatible with Teryair QC Couplers Select Brass, (Code BR) for lower pressure and very frequent connect/disconnect operation Select SS 304, (Code SS) for use in marine atmosphere and for use with water and compressed air Select Carbon Steel, (Code CS) for only compressed air operation.