Sandwich Adapter

The PERMA-COOL Sandwich Adapter is a purpose-built oil cooler mounting solution designed for vehicles requiring enhanced thermal management during high-performance driving, towing, or extended operation. This aluminum sandwich adapter sits between your engine block and oil filter, creating a centralized point to route oil through an external cooler before returning to the engine. Built for mechanics and enthusiasts who recognize that factory cooling systems often fall short under sustained load, this adapter integrates seamlessly into existing engine bay layouts while maintaining OEM-style reliability and durability.

Constructed from durable aluminum with a natural finish, the PERMA-COOL Sandwich Adapter features a 3/4-16 in center thread for secure engine block mounting and dual 3/8 in NPT female ports for inlet and outlet connections to your oil cooler lines. The sandwich design allows full oil flow through the adapter housing while distributing coolant through an integrated bypass passage, preventing pressure loss and maintaining consistent oil delivery under all driving conditions. Weighing just 0.7 lbs and measuring 4.65 x 1.8 x 6.05 inches, this compact adapter fits in tight engine compartments without requiring major modifications or relocating surrounding components.

This sandwich adapter is ideal for street machines, track vehicles, diesel trucks, and any application where oil temperature control directly impacts engine longevity and performance. Installation requires only basic mechanical knowledge—simply unbolt your existing oil filter housing, thread the adapter into the engine block using the 3/4-16 in center thread, and reconnect your oil filter and cooler lines to the NPT female ports. The 3/8 in NPT threads are industry standard, ensuring compatibility with most aftermarket oil cooler kits and remote filter setups. Proper cooling setup can reduce operating temperatures by 20–30 degrees Fahrenheit, extending oil service intervals and protecting critical engine components from heat stress.