Did it have any lines running anywhere else? To the pump, for example? It could be a heat exchanger to help keep the coolant cooler during stationary pumping in hot weather, and to keep the pump from freezing in cold weather.

Hopefully one of the more knowledgeable fire truck guys will chime in here.

On your images, you should be able to attach 5 to each post. You have to select each image individually to attach it. And then hit "Done"


~ John

A kid raised on Hotwheels, Matchbox and Tonka cannot be reasonably expected to own only one vehicle as an adult.

1949 Chevrolet 3804
In the Legacy Gallery | In the Gallery Forum
1973 IH 1310 Dump
1963 Kaiser M38A1
2001 International/AmTran RE3000 "Skoolie"
2014 Ford E-350 4x4 (Quigley)