Universal 1/2 NPT Oil Temperature Sandwich Plate Filter Adapter - M10x1.5 (Blue) O-ring design for the best tightness fitting; no unnecessary oil leakage through the filter area Thread size of oil pressure and temperature sensor insertions: 1/2 NPT// M10 x 1.5// 3/8-16 UNC Diameter of both sensor insertions: 0.875" (outter)/ 0.500 (inner) Inner diameter: 2.25" | O-ring diameter: 2.50" By-pass port mounting nut spec: 3/4-16 UNF// M20 x 1.5