Thermostat Sandwich Adap ter

The EARLS Thermostat Sandwich Adapter (Model 502ERL) is a screw-in oil thermostat sandwich adapter designed for custom engine cooling systems where remote oil temperature monitoring or auxiliary cooler integration is required. This aluminum adapter features a 3/4-16 inch center thread for secure engine block mounting and dual 10 AN female O-ring ports, allowing flexible plumbing configurations for oil lines, sensors, or cooler feed/return circuits.

Constructed from aluminum in natural finish, the sandwich adapter measures 5.6 x 1.6 x 9.65 inches and weighs 1.69 lbs, making it compact enough to integrate into tight engine bay layouts without significant repackaging. The dual 10 AN ports accommodate standard -10 hose fittings, enabling builders to route oil to external thermostats, gauges, or auxiliary coolers while maintaining the factory thermostat function. This configuration is common in high-performance and racing applications where precise oil temperature control or remote monitoring is critical for engine longevity and tuning feedback.

The 502ERL sandwich adapter suits engine builders, performance shops, and enthusiasts upgrading cooling systems on vehicles requiring aftermarket oil management. It is frequently chosen for LS, small-block Chevy, and late-model domestic engine swaps where OEM thermostat housing layouts need adaptation. The sandwich design simplifies installation by eliminating the need for custom manifold machining; the adapter threads directly into the block's existing thermostat port and directs oil flow through the installed sandwich thermostat before distribution to coolers or monitoring equipment. Proper hose routing and fitting selection are essential to ensure system integrity under sustained high operating temperatures.