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Be sure it is smooth and has no holes or scratches. There is a gross weight on the cylinder. If you have any questions about cylinder integrity, weigh the cylinder on a small scale, such as a postage scale. Compare the weight printed on the cylinder to the actual weight. If they do not match, get another cylinder. STEP 5 Screw new cylinder in a clockwise direction firmly into the inflator. Do not over-tighten, but ensure the fit is tight. STEP 6 Check the inflator arming indicator every boating