The "O" ring will not leak air if kept in good condition (smooth,
clean).

I use high quality medical type quick connect/release tubing
couplings, one for each line. You can use the same for a pee-bag
disconnect.

http://www.smallparts.com/products/d...tions/2170.cfm
http://www.sciencelab.com/page/S/PVA...2/60-197230202

I also like to use colored tubing from Wings and Wheels.

- John