for grid installation of Grohtherm Custom Shower system built-in box with removable protection cover waterproof membrame base for wall sealing for masonry and drywall installation fixing points for front and back wall body made of DR brass preassembled ceramic headpart 3/4 connection threads 1/2 flow rate: 55.0 l/min. at 3 bar installation depth 70 - 95 mm min. recommended pressure 1.0 bar