On Nov 12, 9:18*pm, "Harold and Susan Vordos" wrote:

Does anyone have a source for food grade O rings?

No big deal, just contact with ethyl alcohol---home brew variety. *It would
be nice to not introduce tastes or chemicals.

Acid, alkali, oil, ethanol are all in 'food' products, and I've seen a
lot of
food-grade equipment that had to tolerate live steam (for cleaning).

So, the subject of compatible seals is a big one. Not just O rings,
because the crevices in the standard grooves have to be cleanable,
which is a significant nuisance in the usual O-ring design.
Even if the elastic material is compatible, NSF requirements for
cleaning might be hard to satisfy.

At a winery tour, I saw a lot of small vats and a forklift. The
vintner
explained that he didn't use pumps, because 'eventually a seal will
leak'. He did it all by gravity-feed, using the palletized vats
and the forklift to arrange the elevation for liquid transfers.