Protects against dirt Very robust construction of metal and plastic. Connect the suction filter to the suction hose, which is sold by the metre (art. no. 1720-22/1721-22). It protects against dirt and thus damage to the pump. The non-return valve shortens the suction time, so that pumping is more efficient. Complete with hose clamp for easy attachment. For suction hoses with a diameter of 19 mm (3/4") or 25 mm (1"). Non-return valve The non-return valve significantly shortens the suction time after switching off, allowing for efficient pumping. Longer service life The robust construction of metal and plastic ensures a long service life. Completely ready for connection Complete with hose clamp for easy attachment. High-quality and completely ready for connection The high-quality suction filter can be easily connected to the suction hose (sold by the metre).