Ultra-flat sink trap without water seal (height under sink: 64 mm) fitted with a silicone membrane which opens to allow water and waste to pass through but closes afterwards to block unpleasant odours;The Senzo comes does not come with a water seal, making it lighter and more flexible;Can be compressed with ease, folded to an angle of up to 90 or positioned horizontally or vertically, and can be used with or without a threaded elbow-pipe;Push-fit connection with no screws or gluing required; the double-lipped seals and the connector ring guarantee a perfectly waterproof installation;Water flow (from a height of 120 mm) - in horizontal format: 0.83 l/s; in vertical format: 1.16 l/s. 1.5-inch input; 40 mm diameter output;Water flow (from a height of 120 mm) - in horizontal format: 0.83 l/s; in vertical format: 1.16 l / s input # 1 1/4 outlet 32 mmWirquin