Hi,

Just before I start - what's the current wisdom on sealing immersion heater
threads?

a) PTFE
b) Gas PTFE
c) Something funky from http://www.bes.co.uk/products/213.asp

Obviously I'll avoid the traditional hemp and Boss White as I'd like to be
able to undo them one day without turning the cylinder into a pice of
modern art(!)

Also, which is reckoned to be the best bet for smaller taper threads, like
3/4" sensor pocket doobries?

All the rest of the connections are direct to 22mm compression which is
nice - less fiddling.

Cheers

Tim