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Posted by D Sherman [72.47.9.228] on Thursday, July 14, 2011 at 19:39:14 :
In Reply to: metric (i think) plumbing question posted by mannyc [173.77.206.116] on Thursday, July 14, 2011 at 19:11:36 :
That raises an interesting question. Does the rest of the world use metric pipe threads that are different from ours? None of my engineering handbooks, albeit fairly dated, as anything about metric pipe fittings. I would say take it to your best local hardware store and see what they have. There's nothing like having your thingamajig in hand when you try their doohickey on it.
Iron pipe threads and compression fitting threads are close enough to the same size that people sometimes jam one onto the other (it doesn't hold, but they try). Maybe you're thinking it's a pipe thread and it's really compression or vice versa? There are also straight pipe threads, same pitch and diameter but not tapered. Of course it might also be some custom piece with that spigot designed just to fit that water bag.
Would it be possible to cut off the spigot in some way that leave the threaded part screwed into the bag and gives you a stub that you can clamp a hose onto with a hose clamp to connect to your valve (or just pinch the hose off)? Sometimes when I run into things like this with some non-standard threaded part, I end up keeping the threaded parts, and cutting off the piece I don't need and attaching something else to it. I recently did that with an adjustable mirror bracket that stuck out too far, but had a special fine thread on the tube that I couldn't recreate. Instead of cutting off the end of the tube and trying to re-thread it, I cut a chunk out of the middle of the tube and brazed the two ends together.