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Originally Posted by Markus Splenius
Thread size. For some reason all the pipes have gone metric but
anything threaded is still imperial. 15mm fittings = 1/2" threads.
Wonder why that is? What if you get a french threaded coupler? Would
that really confuse a UK plumber? :-)
M.
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Yes, but gues what Frenchy stuff is turning up. Mostly the toilet inlets with Foreign thread come with an adapter (USA USE SAME FOREIGN SYSTEM) to 1/2". I haven't found a way to purchase them seperately.
15mm compression fittings all have 1/2" male threads on so these can be used without the nut and olive for certain jobs.
The same is not true for 22mm, these do not have a 3/4" thread. What a missed oportunity?
Very often parallel threads are made with parallel threads, just use a lot more ptfe than usual. Of course for gas the only parallel thread allowed is the Long Screw, but for water parallel threads are commonplace.