This Jobe Valves Topaz Part Fill Valve is ideal for use in water tanks which are filled by a pressure system controlled water pump. The part fill valve gives a level difference which is adjustable from 50 mm up to 2.5 m to minimize starting and stopping of the pumping system. This part fill valve can be removed from its base for easy cleaning with a simple 1/4 turn. Its compact, robust construction makes the valve long-lasting and durable. Additional filling of your tank will not affect the valve, since it is designed to remain under water and only activate when the tank runs low.