Auto Fill Valve is perfect for both permanent and temporary installations. Non-toxic, tasteless, and can be used for drinking water. 3/8" BSP valve with 1/4" fitting. Adjustable float. This is the smallest adjustable float valve in the world. It could be easily used in aquarium and mini water supply equipments which has limited space for float valves. Flexible arm can adjust the water level without the relocation of mount position. Pulling out the linchpin, reversing the arm position and pushing in again can convert the side-mount to the top-mount and vice versa.