Anyone have an internet source for british fittings? I have an indirect tank with metric, NPT and BSP threads. Arggh!!!

Check McMaster-Carr

http://www.mcmaster.com/#brass-british-standard-thread-pipe-fittings/=f6kxeg

Many thanks.

If you use bsp fittings you are going to need a method to seal them.  The europeans use hemp.  It binds the thread up and swells up with liquid.  It's a bit like a hose fitting without the washer.  Doesn't make much sense to me that's what they do on the other side.  If your hemp days are over you could simply wind the npt into the bsp.  It works.  Coat the female thread with yr favorite sealant (gasoila), get some lock tite 55 (you tube) and heavy PTFE tape for the male side.  Not all the threads will bind but enough to do the job.  Good luck!