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Carl If you get a penis pump, buy this. Greatly improves the seal and comfort of use. This $10 item makes all the difference.
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Roderick H. Penis Pump Replacement Sleeve | Optimum Series Universal Fit
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Nelson L. Penis Pump Replacement Sleeve | Optimum Series Universal Fit
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JP At first sight I thought this sleeve looked to big for my 2-1/4" pump, but its actually a perfect fit. Very comfortable and does not loose vacuum. The inside diameter of this sleeve is 1-3/16" for a length of 1-3/8". I've been using this for three weeks now with-out any issues. Sleeve is extremely soft and pliable, made from 100% TPE. Sleeve comes wrapped in cellophane to keep it from drying out.
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Barton M. Penis Pump Replacement Sleeve | Optimum Series Universal Fit