Thank you, Now that I have that straight I think I just might make room to splice in the air pump hose from the fish tank to the assembly to help pre-cool the lapped hs. I will drill the hs and silicone it to the stock hs, and this experiment will include the copper shim I just ordered. Air pump $3.75 at online pet store, shim cost me more. Invention is the father of nessecity(I never can spell that word).