On Mon, 20 Oct 2008 18:40:07 -0400, bq340 wrote:

wrote:
Any suggestions for lubricating O-Rings that are used for water pumps,
basically I want to extend useful life as much as possible. Someone
suggested lithium grease?

SD
Petroleum Jelly (Vaseline)

I don't think so---will eventually ruin the O ring
mld

I do. Petroleum and Butyl rubber are completely compatible.
Use of Vaseline on Buna-n O-rings is a standard procedure.


What if the OP's pump body is plastic? The lube has to be compatible
with all the material it contacts....

The question was about O-rings. Not plastic.
Most plastics fair well will petroleum.