a good cheap purge gas is helium! and it's relatively available at most grocery stores, and wall mart!!! like 20.00 for a 15 lb size of helium! and they usually have a rubber connector you can push into the hoses to flush them! (I already discussed this with steve on the phone, I'm posting it here for everybody else!)
I can just imagine the sounds of the mechanics working on this... mickey mouse and minnie!!!
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