Body and plug: DZR brass CW625N, Nuts: Brass CW617N, Dismantling fittings and other internal parts (in contact with water): DZR brass CW626N, Other components (not in contact with water): Brass CW614N, Filter screen: Stainless steel grade 304, Spring: Spring steel, Cartridge: Acetal, Bonnet (upper cap): Polyamide, Gaskets: Pressed fibre, Diaphragm, seat gaskets and O-rings: EPDM.