Do the compressed-air fittings (there's a nice 3/8" full-port valve with male threads, where most fo the other ball valves have female on both ends) have the same thread count as NPT or this die, or do I need to use plumbing fittings only?
I just reread your post...I think I did exactly that a few years ago for a presto pot. My recollection is that it worked, but the fitting didn't thread all the way through...a bit fragile, but workable.
Dangit, I figured. Can it be that HD doesn't carry threading taps? I guess I can look around for plumbing supply places, but sheesh this should be easier inch:.
Wait, I wonder if the bind (we're talking super-thin aluminum wall here) would be OK to seal anyways?
JB Weld to seal and treat it like a bulkhead? That way you're basically sandwiching the aluminum and not relying on it to hold its thread. Just a thought.
I made one a few years back. The aluminum Is thin and hard to tap so I packed it with JB Weld and has held up good. When using the wax melter the wax at the end of the ball valve cools and will not flow . I use a propane torch to melt the wax in the fitting, works great ,good luck.
When using the wax melter the wax at the end of the ball valve cools and will not flow . I use a propane torch to melt the wax in the fitting, works great ,good luck.
I've seen that others have experienced this also which is why I was hoping to be able to use the compressed-air fittings; they are male-threaded and eliminate the need for the nipple (keeping the whole fitting warmer).
Do you know a machinist? He'll have a NPT tap at home!! Just remember, the size of a standard thread tap is WAY different than the size of pipe thread, and not just because of the taper. For instance, 1/4" pipe is way larger than a 1/4' drill bit. Threads per inch is different also.
got my pipe tap at Aubuchon hardware when I made my presto pot and one for a friend. As was mentioned, the metal is very thin. Tap carefully and keep checking for fit.
No.
NC = national couse
NPT = national pipe thread (which is tapered)
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