LF37 Liquid level pressure swich Dimension in:mm LF37 Order Ref NO LF37 - 111 -4.5"-6"H20 ABC Pressure setting:cut in :6"H20 ; cut off :4.5"H20 LF37 diaphragm pressure switch is available for various sumps, effluent, and sewage application to control the liquid level. Various switch settings are available for to turn-on or turn-off the pump. The diaphragm pressure sensing design make it more reliable than traditional float ball mechanism. Port connection design make it can sense the pressure without immersing the liquid directly.