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FYI, I bought a Kat's heater on the interweb, supposed to be for a CAT 3116. Specs said 1-3/4" OD. Well, the seller apparently measured the FLANGE, not the mounting surface with the o-ring. The mounting diameter (=required hole) was only 1-1/4". So, if you look for cheaper alternatives like...

Good subject, IMHO, considering most FMTV owners are new-ish owners. The FMTVs are considerably different from other MV's in many ways. Great info on block heater and air dryer Suprman. TN winters are not terrible but we get many below freezing nights and cold starts are tough on equipment...