Bette B50-1046 Flush-to-floor Installation System The Safe System for The Installation of Flush-to-floor Showers The installation system accurately matches the flush-to-floor shower area BETTE FLOOR & the ultra-flat BETTE SHOWER TRAYS. With a minimum installation height of 65mm for drainage through a floor cavity Also suitable for the refurbishment of old buildings & fiddly renovation work Meets the requirements for sound installation in building construction according to DIN 4109