I use the plug O-rings as my guide. Rub your thumb across the O-ring. If nothing rubs off, the rings are good. Naturally, if a poppet valve gives me trouble, I'll rebuild then.
Otherwise I just scrub them out and sanitize.
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Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
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