This Mishimoto Oil Sandwich Plate is a lightweight, high-flow sandwich plate that's used to regulate oil flow to the cooler until the engine is properly warmed up and allows for oil system protection in cold climates. This Oil Sandwich Plate is designed specifically for M20 or 3/4"-16UNF Stainless Steel Center Bolts and has two 1/8" NPT plugged ports for optional sensors or gauges.