The Rotalock male Refrigera Industrial are made entirely of brass. Are provided include the Teflon seal. They are available in the following sizes: 1 "x 12mm 1 "x 16mm 1-1 / 4 "x 22 mm 1-1 / 4 "x 28 mm 1-3 / 4 "x 35mm 2-1 / 4 "x 42mm