well, i dont knwo about gumming up, but a ball valve of that side is going to cost you a fair bit. definatly if you are going to go with a steel one or something. probably should not gumm up that bad.. probably a bit though, but should clean up when you turn the valve. i would recommend using propane, then it definatly will not (or something that combusts completely(
i dont know how expensive the 3inch pvc ball valves are, or if they make them that big.
just though abuot this... why dont you get a small computer (CPU) gfan. you can run that off like a nine volt battery or two.
then just attach that to the end of like a 1inch ball valve (pcv) and then go from them. you can get onese that go a couple thousand rpms... that should take about a couple seconds to air out the chamber..., while you are putting in another spud and getting readym by that time it would be done...
just my thought. (c) of course. lol jk
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