ADJUSTABLE PRESSURE FUNCTION: This is a water pump pressure control switch for perfect pressure control. Pressure switch with 30-50 psi pressure setting range activates an electrically water pump within a power circuit when the adjustable rising and falling thresholds are reached.WIDE APPLICATION: 1/4inch Female NPT, standard water well pump replacement switch designed for use of electrically water well pumps of all types (, Submersible, Reciprocating etc).HIGH-QUALITY MATERIALS: The pressure control switch is made of high quality materials for strong strength and long durability. contacts for longer servicing life open on rising pressure.EASY TO USE: The water pressure control is easy to use, stable in performance, protects the motor, saves power, and can be used for a long time.Specifications: Internal thread 1/4 30-50PSIMaterial: plastic metalcolour: greyPackage Contents: 1 x water pressure switchOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.