John Galloway wrote:
Aldo,

Thanks. Yes I should have been more clear - I am thinking
about equipment for a new glider. I have had the triple
probes on 2 previous gliders without too much problems
from the O rings. I have variously used a little PTFE
or silicone dry lubricant on the rings of the probe
itself as it is noticeable that when the probe gets
stiffer to insert you get some rubber marks on it from
the internal rings.

I wonder if there is any better way of preserving the
O rings?

I've always used a hardware store silicone grease by GE on mine. The
ones on the ASW 20 C were still good when I sold it 11 years; the ones
on my ASH 26 E are still good after 9 years. We have 100+ degree summers
and sub-freezing winters. Good O rings should last indefinitely as long
as they aren't used "dry", as they do in much more severe conditions,
like shock absorbers.

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Eric Greenwell
Washington State
USA