ND 40/50 Water trap: 50 mm Flow rate: 0,5 l/s (with 20 mm water built-up) Tested to EN 1253-1 Installation height: 100 to 128 mm Installation height atACO ShowerDrain M: 103-128 mm ACO ShowerDrain M+: 105-140 mm ACO ShowerDrain Public: 115-140 mm ACO ShowerFloor: 125-160 mm 9010.81.20 ND 40/50 Water trap: 30 mm Flow rate: 0,5 l/s (with 20 mm water built-up) Installation height: 80 to 128 mm Installation height atACO ShowerDrain M: 84-128 mm ACO ShowerDrain M+: 84-140 mm 9010.81.21 ND 40 Water trap: 25 mm Flow rate: 0,5 l/s (with 20 mm water built-up) Installation height: 54 bis 128 mm Installation height atACO ShowerDrain M: 56-128 mm ACO ShowerDrain M+: 56-140 mm 9010.81.22 ND 50 Water trap: 50 mm Tested to EN 1253-1 Flow rate: 0,5 l/s (with 20 mm water built-up) Installation height: 15 bis 128 mm Installation height atACO ShowerDrain M: (15 *) 70-128 mm ACO ShowerDrain M +: (15 *) 70-140 mm ACO ShowerDrain Public: (30 *) 70-140 mm ACO ShowerFloor: 115-160 mm * by shortening the foot (core drilling) 9010.81.23