Prosource Diesel Stoplight Switch Fitment Class 4-8 commercial trucks1/8in NPTOpen (0 psi), Closed at (4 psi). High Quality Stop Lamp Switch Connecting Thread 1/8-27 NTP 2-Blade Connector Type Actuation: 65 PSI Deactuation: 75 PSI Threaded Sealant Total Part Length 2.25 Inches Sold Individually Warranty On Stop Lamp Switch Against Defects In Workmanship & Material From Date Of Purchase