Scratch my question. I realized that what I need is called a
"thermowell". I will install just that.

i

On Thu, 5 Oct 2006 17:25:45 +0000 (UTC), Ignoramus4299 wrote:
I have a very old spa that likes to give me headaches.

It has a hole for inserting the thermostat's bulb, which unfortunately
is very close to some other object insidethe control unit, so I can
insert the bulb, but just barely.

The hole is in a PVC fitting with threads on the outer side and hole
on the inside where I put the bulb through.

Anyway, my question is, what is a good way to prevent leaks in that
area where the bulb enters the hole. Plumbers putty does not seem to
work well in the long run.

thanks

i