Oil Temperature Sump Plug Adapter. Size: M12X1.5 Sump Thread- 1/8" NPT Female Sender. Fitting, Metric Adapter, 1/8" NPT NPT Female Thread to M12X1.5 Male Thread. For use with pressure & temperature gauges. This adapter is made from solid brass and offers a simple solution to the fitment of oil temperature sensors into the existing sump plug hole. It's supplied without a oil graded dowty seal its matching 1/8" NPT brass blanking plug in case the sensor is ever removed. This adapter is suitable for sensors with a 1/8" NPT thread. This handy adapter allows the fitting of an oil temperature gauge without having to modify the engine sump. PLEASE CHECK THREAD BEFORE PURCHASING. SIZE: M12 x 1.5 SUMP THREAD ( MALE ) & 1/8" NPT SENDER THREAD ( FEMALE).