Air Management

[canadian trucker]

you need one valve for filling the bag and one to deflate it now you can get valve blocks which have just 3 lines attached to them 1 air goes in from your tank, 2 air goes to the bag from the valve, 3 a small line to your gauges so you know the preasure.

anyways a valve block has two valves on it so you one for inflating and one for deflating, no need to run double ported bags or a 'T' some where between the fill valve and the bag so you can run your deflate valve..

i hope i did not confuse you because i sure did myself