Quote:
Originally Posted by BruceK
And, when you replace, smear grease top and bottom of the O ring to ensure a seal, wiping away the excess.
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If you're using neoprene O-rings, grease, e.g. Vaseline or any petroleum product will soften the O-ring and cause it to swell, ultimately ruining it. Use dielectric silicone grease, it's safe on any O-ring. Never use Vaseline on plumbing parts, it breaks down the rubber.