Union O Ring Lubricant?
 

On the underwater housing for my digital camera there is a O ring and the instructions call for applying a light coating of silicon gel (feels like vaseline) to the the O ring before sealing shut. Does anyone use anything on the O rings in PVC unions?

post
 

For your PVC Union spit works great. Or nothing at all will be fine.

oring lube
 

we use gel or paste silicon lube. reduces chemical breakdown of o rings.

doug