The Derale Fluid Control Thermostat is a billet-style cast aluminum unit with 1/2 inch NPT ports that manages oil flow to a remote cooler. It lets oil bypass the cooler until the fluid reaches 180 degrees F, then the internal thermostatic valve routes all of the oil through the cooler while holding system pressure steady. This helps the engine or transmission reach operating temperature sooner, which is useful in cold climates. The housing can be rotated 180 degrees to reverse the flow direction, and it carries an ultra-bright billet finish.
Specifications:
- Type: Fluid control (bypass) thermostat
- Ports: 1/2" NPT inlet and outlet
- Activation temperature: 180 degrees F
- Flow capacity: Up to 20 gallons per minute
- Pressure rating: Up to 200 PSI
- Material: Billet-style cast aluminum, ultra-bright finish
- Installation: Reversible flow, housing rotates 180 degrees
- Part number: 25719
FAQ
What does the Derale 25719 thermostat do?
It bypasses the oil cooler until the fluid reaches 180 degrees F, then sends all of the oil through the cooler, helping the system warm up faster and hold a stable temperature.
What port size does it use?
It has 1/2 inch NPT inlet and outlet ports.
How much flow and pressure can it handle?
It flows up to 20 gallons per minute and is rated up to 200 PSI.
Can the flow direction be reversed?
Yes, the housing can be rotated 180 degrees to reverse the flow direction for easier plumbing.

