pre-assembled, frost-proof, when closed, metal parts in contact with the medium made of gunmetal, suitable for quick, retroactive installation in finished exterior walls, extendable, inner part for quick opening, discharge rate 40 l/min (1 bar), installation depth min. 150 mm/max. 492 mm, with functional aerator for automatic emptying, with hose coupling for common plug-in systems, operating temperature max. 90 °C, EPDM seat seal, PN 16, dead space free