Waterproofing kit for on-site showers, both for renovation and new construction, with AISI 304 stainless steel grating to fit up to 12 mm ceramic inside. 40 mm horizontal and vertical drain and 44.6 l/mn evacuation that complies with EN274 and EN1329-1 standards. Equipped with a removable siphon for easy and convenient cleaning. The Kit incorporates the WATERPROOF.5 waterproof sheet, to provide total watertightness of the shower tray and to ensure that in the case of leaks through the joints of the floor, the water always ends up in the drain.