Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

  I suggest the 1/4" od tubing.  That is what I had laying around
the last time I fixed an Empire sightglass.  I wasn't sure it
would be ok, boiling water didn't hurt the tubing, so I gave it
a try.  Just a tiny bit of a weep that didn't even drip, so that
worked. 

  The last time I used twisted teflon tape was on a Marklin sightglass
and that worked pretty near perfectly.  I also used it as a ring on an
Elektro engine piston and valve-rod with some success.  Those Elektro's
tend to have a lot of blow-by - IMHO, bad engineering, but I love 'em.

Good Luck,
Wayne