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This post has been edited 1 times, last edit by "Bumbleball" (Sep 14th 2010, 10:32pm)
I highly doubt that was installed without any glue at all. Improperly glued most likely. You can try to do what you've suggested. You might get it to work. There's a good chance you wont be able the fitting to come off. They do have a tool to drill the pipe out of the fitting but you don't want to go to that expense.
If i was you I'd completly rebuild the entire manifold. It looks simple enough. I'd install the valves farther apart. Then again they wont fit in the one box if you do. You'd like to be able to unscrew one if need be. The job will probably take about 3-4 hours for a first timer. 1 1/2 - 2 for a pro.
The photo doesn't work. Try an upload to Imageshack and bring back the link. If there isn't one already, maybe you could install a master valve for the system, which would make any tiny leaks downstream of the master valve immaterial.
This post has been edited 3 times, last edit by "Bumbleball" (Sep 15th 2010, 2:53pm)
It still looks like these are threaded valves, and as such, you could unthread the valve in question, and reseal the threads with more teflon tape. Downstream of the valve, you would need some sort of union or slip-fix connector.