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 driven 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 driven water well pumps of all types (Jets, Submersible, Reciprocating etc). HIGH-QUALITY MATERIALS: The pressure control switch is made of high quality materials for strong strength and long durability. Large 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 30-50PSI Material: plastic metal colour: grey Package Contents: 1 x water pressure switch / 2 x water pressure switch 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.