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When putting on silicone grease use a very small amount and rub it between the tips of your thumb and index finger. Then coat the o-ring without causing any build up by rubbing the o-ring between your thumb and index finger. Make sure you use a O2 o-ring and silicone approved for O2 if your are using the o-ring on a device that will be used with nitrox or other mixure.
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