Freely adjust the water level to reduce the frequent opening of the water pump. Super water flow 200-600L/M: The water level of opening and stopping can be adjusted arbitrarily between 50-2.5mm. New plastic, PA66 nylon material, high toughness, wear resistance, corrosion resistance, no release of harmful substances. Application : suitable towers, pools, water tanks, agricultural irrigation, animal husbandry, spray equipment and swimming pools, etc. Colour:Black + White Material:nylon+rubber Size:TB20(0.75 inch) Package Contents: 1 x water level control valve Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.