I put them in the dishwasher before use. I haven't tried turning the bottle upside down to check the cap for tightness, but the rubber material itself and the quality looks great. The only thing I didn't like was the plastic container the caps were sold/packaged in when I received them. It would be a good idea to keep this box to store unused caps when not in use. I just threw it out of the broken stock due to a defect or Revain damaged in transit.?
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