FLEECE PERFORMANCE COOLANT BY-PASS SERVICE KIT-Complete kit to service your Fleece Performance Coolant Bypass - Includes all O-rings, fasteners, and a new thermostat for the rear block.

*Two thermostats are included to service all models of our coolant bypass kit, you will only use one (1) of the included thermostats when replacing your bypass thermostat. This kit does not include the Cummins thermostat. We recommend the use of a Cummins 190° thermostat in the stock location.

**The kit includes 3 new square cut O-rings, 1 new standard O-ring, and 2 new O-rings for the AN fittings. Depending on the kit you are servicing, not all O-rings will be used.