Originally Posted by staleg
Thanks for your answers.
Unfortunately, the holes in the firewall aren't large enough for 3/4" hoses.
If I understand Cobalt 327 corrct, I'l try the Summit reducer.
The Summit part still requires you to put the 3/4" supplied piece of hose onto your heater barb. It seems to me if that
would fit, so would a length of 3/4" heater hose. I must be missing something...