Question for you guys, I have the mercuiser system with the air pump. I need to change the air lines out and Merc wants like 50 bucks for the tubing. What is the size of this tubing? I know that it is a rigid type tubing. Is there tubing that can be purchased at a hardware store that will work for this application? Thanks for the help.
Brian

I just replaced all of mine. I went with the quick disconnect type fittings, and 1/4" id plastic tubing. I used all Parker stuff that I found at a local hydraulic supply house.

how much did you spend?

have plenty of it upstairs in our parts room

Home depot - about $5. I did mine - worked great.

Thanks for the input. I will look at the Depot next time I am there. What size fittings are used on the acuator side of the tubing??
Brian