last time i had our rc100 out stacking snow i realized that the lower rad. hose was rubbing against the water pump housing and developed a leak where it wore through aganist a bolt head. i called the shop and they want $130 for this 3" corrugated hose, book says it 45" long. my question is, can i use any old 3" hose that i can find at NAPA or auto parts store? i mean the cooling system isnt under any higher pressure than a standard cooling system, say 13-16psi right? there are some semi truck shops around by me and they should have something along those lines.