Oil Block Adapter 1/8 PT Ports for Sensors, Size M20 & 3/4" UNF - GReddy Oil Filter Block adapters provide an easy way to install oil pressure and oil temperature gauge sensors. Now, one unit includes 3 different threads and 2 different o-ring diameters to fit most Japanese engines. Made from billet aluminum and simple to install, this adapter mounts between the oil filter and engine block. Easy, straight-foward installation. High quality greddy unit for long term reliability. Notes M20XP1.5-70mm & 3/4X16UNF / Adapter port (larger) M12x1.25 1/8 PT (Japanese Pipe Thread- Same as BSPT. Not Same as NPT) Images used may be generic. Actual product may vary.