The fittings EFFEBI PRESS “UNICO” are in Copper Cu DHP 99,9 and are usable for both WATER and GAS. The marking on the fittings ( Gas in yellow and water in blue ) are clearly showing this universal range. The O’Ring is conform to the EU norms EN 549 e EN 681/1. The threaded press fittings are manufactured in bronze RG5Pb.