4 lb switch for aircraft requiring an oil pressure activated hourmeter. Single circuit 2 terminal. Specifically designed to stand up to extended duty applications. Direct action blade contact of silver alloy, gold plated. Operating pressure: 150 PSI for 0.5 – 24 PSI (factory set at 4 PSI). Burst pressure 750 PSI. Ratings: 15 A – 6 vdc, 8 A -12 vdc, 4 A -24 vdc. Connector: 1/8 – 27 NPT male thread, terminals #8-32 screws. Total length: 2.3″, width 1.47″.