Poorly made and/or defective! The plug is too small for the hole it is trying to plug. Air mattress plugs are usually very tight and must be pushed in to create a tight seal. In this air mattress, the fork is too small and a light touch of the fork with your finger will cause the fork to fall out completely and the air mattress will be deflated. If the cork manages to stay inside, it will fall out as soon as any weight is placed on the airbed - even a hand. It's useless. I've tried using it for camping and have gone through "inflate plugs then immediately fall off" 6 times. One day the prong fell out because it lightly brushed against the tent while I was gently moving the air mattress. Eventually I gave up and fell asleep in the chair. (I followed all the instructions and inflated/inflated the mattress for 2-3 days to allow for plastic stretch. Unfortunately the cork deflated so who knows, stretch actually happened.) Don't buy this - it is not worth the trouble at all.
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