Davco heater thermostat?

Well, I had a small coolant leak, pulled the hose off to cut a new end, and found the nipple was cracked off at the base. I pulled off the fitting, and it looks to be a thermostat? Coolant hoses go in and out of this, while the top part sits inside the fuel hose fitting. I've typed in every related word I can think of to find a new replacement. Anyone know what this guy is called and/or where to get it? No clue on the number of the davco fuel filter setup either. No numbers or markings anywhere on it. Truck is a '99 379.

 

I dont know the model. And I know thats the heater, but inside its got a spring and a plunger that looks like a thermostat. Can I just bypass this, plug where it goes into the fuel fitting? Because the other side of the little fitting just goes right into the filter housing. Can the fuel get too hot? Maybe thats the reason for the "thermostat" thing.

 

Yeah, I priced one out already. Lol. Hoping I dont need to spend the coin just because of this little deal. Thank you!

 

Northeast Nebraska. I'm gonna see if vander haags will let me wander their yards, but they usually won't.