They carry large diameter hose and are able to pump water to various parts of the water system when there is an earthquake. They isolate the problem area and restore service to a larger area. I'm sure that someone else on here can explain this in depth more.
Ed Saliba Jr.
1st Assistant Chief
City of New Kensington Bureau of Fire
I.S.O. Class 4 Department
1st Assistant Chief
City of New Kensington Bureau of Fire
I.S.O. Class 4 Department