When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I am installing a SVO conversion on my IDI and the heater has an in and an out, I couldn't see why it mattered but just to be sure, which heater hose is going in to the core and which is coming out.