This sandwich plate fits between the engine block and the standard oil filter, giving you two female 1/2 BSPP ports to tap into full engine oil flow without cutting into the block. The centre thread is 3/4 x 16 UNF, which is one of the most widespread oil filter thread sizes, so check your filter before ordering. It is the standard way to plumb in an oil cooler, a remote filter head or an oil temperature and pressure take-off on a car that was never designed for one. Machined from billet for stiffness so the plate does not distort under clamping load. Fit the supplied sealing ring correctly, check clearance to surrounding components, and check for leaks once hot.