Plumbers grease vs faucet lube

Please advise as when to use plumber's grease, and when to use "faucet lube".
Item to be lubricated is the piston valve (o-ring seals) in a shower mixer.
Thank you.
snipped-for-privacy@vuden.com
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snipped-for-privacy@none.com wrote:

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snipped-for-privacy@none.com wrote:

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snipped-for-privacy@none.com wrote:

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What's the difference? Tom
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