Rob,
I'm not really convinced that CO2 is indeed lost to a great extent when using regular clear air tubing. Still 75' is quite far. I've used air tubing for a distance of about 25' and it worked ok.
Instead of copper piping why don't you try the CO2 proof black tubing? It has quite thick wall and it's pretty rigid.
--Nikolay
I'm not really convinced that CO2 is indeed lost to a great extent when using regular clear air tubing. Still 75' is quite far. I've used air tubing for a distance of about 25' and it worked ok.
Instead of copper piping why don't you try the CO2 proof black tubing? It has quite thick wall and it's pretty rigid.
--Nikolay
