These in tank coolant-based heaters are made by Arctic Fox and meet the highest level of quality in the industry (ISO-9001). They are covered by a 5-year--600,000 mile warranty. This model fits tanks 17-19" deep and has 1/2" NPT fittings for both coolant ports and the fuel port.

From the manufacturer's website:

* Lowest profile 1 1/3" (34mm)
* Stainless Steel
* All-welded construction
* Sizes for all tanks
* Rotates for easy mounting
* Mounts in vehicle sending gauge opening

Get faster warming and cleaner installation with the HOT FOX fuel warmer from Arctic Fox.

It truly is an in-line warmer that installs in the fuel tank. The simple 1.5" (38mm) diameter stainless steel tube inserts in the tank through a standard USA fuel gauge sending unit opening. Coolant passages inside the tube surround the fuel standpipe to provide excellent heat rise. The internal fuel line features an exclusive spiral design to offer larger heat exchange surface from warm coolant to cold fuel.