The sūsa HyperFlow Billet Sandwich Oil Filter Adapter provides easy access to the oil supply for installing Setrab ProLine Oil Coolers. Engineered for performance, reliability, and integration with the sūsa ProLine M22 adapter fitting system, the sandwich oil filter adapter is machined from billet aluminum with generous positive flow characteristics. Designed to direct oil through the oil cooler at all times, it is particularly suited to dedicated racing vehicles. Includes 1/8"-27 NPT port and plug for optional installation of sending unit accessory gauge, e.g., sūsa Thermal Switch (thermal switches sold separately). Sandwich oil filter adapters install between oil filter and oil filter landing for simple access of oil supply to install an oil cooler. For use with sūsa ProLine fittings and hose ends up to -12 size.