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Adjustable strain function: This is a water pump stress management change for splendid strain control. When adjustable upward thrust and fall thresholds are reached, a strain change with a 40-60 psi stress ambiance differ activates the electrical water pump in the energy circuit. Widely used: 1/4 inch internal thread NPT, traditional effectively pump alternative switch, designed for all types of electrical well pumps (jet, submersible, reciprocating, etc.). Premium material: the pressure management change is made of fantastic materials with excessive energy and durability. The contact would be opened when the stress rises, extending the service life. Easy to use: water pressure management is straightforward to use, steady performance, motor protection, energy saving, long-term use. Material: plastic colour: gray Package Contents: 1 x pressure change for effectively pump Only the above package content, other products usually are not included. Note: Light mirrored image and varied reveals can cause the color of the object in the photo a bit varied from the real thing. The dimension allowed error is +/- 1-3cm.