Behind-Cab Hydraulic Cooler

The THERMAFLOW SS675 hydraulic wet kit cooler is mounted behind the cab and across the frame rails, keeping the unit completely free from road debris. This unit is a powerhouse, boasting twice the capacity of our frame mount models. This wet kit allows you to drive higher horsepower applications like bulk feed trailers, VAC pumps and pneumatic blowers.

Oil Market
Food Grade Market
Bulk Feed Market
Chemical Transport Industry
Propane Bobtail Stabilizers


Strong Design:

This hydraulic wet kit cooler has a stainless steel construction, ensuring great looks and long life. Unlike steel units, does not rust and is easily shined to keep your trucks looking top-of-the-line.

                                  Heavy Duty:

Suitable for tough and demanding mobile hydraulic applications.

"No Drill" Optional Mounting Kit

Instead of drilling into the frame rails, mount your wet kit instead with an optional set of clips. Just as strong as drilling, these clips make the unit easier and faster to install and don’t compromise the integrity of your frame.


Flow Rate: 50 gpm

Max Pressure: 3000/5000 psi

Reservoir: 7.2 gallons

Weight (Dry): 100lbs

Warranty: 2 years

Dimensions: 31.5"(L) x 12"(W) x 37"(H)

Suction port size: 2″ MNPT

Pressure port size: 1" MJIC

Return port size: 1" MJIC

Model Options


Electric (E):

The Electric fan motor option has a 12VDC cooling fan which is operated with a temperature control switch. This switch gets wired into keyed power. When the key is turned on, the switch will be ready to activate the fan when the oil temperature gets to 110°F. When the oil temperature falls to 105°F the fan will turn off.

Hydraulic (H):

The Hydraulic fan motor option has a fixed pressure compensated flow control that automatically cycles the fan “ON” when the hydraulic system is running and “OFF” when not running. This option comes plumbed from the factory.