VIA90111 Pressure switch w/relay

• 1/8" npt thread
• On @ 110psi
• Off @ 150psi

Moisture resistant and tested to last over 10,000 cycles. They measure 4.25" x 2.25" and come with 1/8" male port fitting. Leads are pre-fitted with insulated male push-to-connect terminals that are clearly marked.* For 12-Volt systems only - up to 40 amps 

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What is this for?

A Pressure switch is a form of switch that makes electrical contact when a certain set pressure has been reached on its input. This is used to provide on/off switching from a or hydraulic source. The switch may be designed to make contact either on pressure rise or on pressure fall.