The 4-chamber diaphragm pump, makes the water flow particularly smoothly and quietly through a smooth running motor and a soft mechanical bypass control. Each pump head has a non-return valve for over 13 bar. The pump remains quiet both when starting and closing the faucet, without rattling. 2.1 bar, 12 V, max. 5 A. The pump is self-priming up to 3.1 m and has a hose connection of 10 mm.