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M25 and M25x2 are straight threads, aren't they?
Well, as far as my eye can see, this thread is not straight...
3/4 was my first idea too...
The problem is, when I look at new 3/4 valves, the o-ring is not in a groove like the original valves resulting in the valves not being against the neck of the tank.
so after a long time, I found the chance to have a look at the cylinders...no groovy grove...
would it be possible to get a grove made in the cylinder neck?
Hopefully this week I'll have time to give my "tank supervisor" a visit and I'll ask if if would be possible to bore a groove in the tanks (jup, I've got 2 of them (originally a D11.6 )
If it works out ok, I'll have a complete modular set (got a manifold for the new L and R valves)
OK... the tank supervisor gave me a cold shower this morning...short answer: NOOOOO, get yourself new cylinders, or other (impossible to find) valves...