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One New Replacement Adjustable Pressure Switch. Made to Fit: Several Hobbs or Honeywell Models Tech Info: Single Circuit with Two Insulated Terminals. This is a 4 # N/O Pressure Switch Typically Used to Activate Hour Meters from the Engine Oil Pressure Specifications: Contact Setting: 3.1 PSI to 7 PSI Factory Setting: 4 PSI Operating Pressure: 150 PSI Proof Pressure: 500 PSI Burst Pressure: 750 PSI Normally open. Closes at 4 PSI. 1/8" Male Pipe Thread Connection Replaces Part Number: 76575-4 All OEM part numbers and logos are to be used for identification purposes only