Scam: Beware of systems that are prone to leakage. It's a nightmare to fix a broken zipper or air pump and very costly. Cheap valves are a thing of the past. They still make them but the new ones that are coming out now are two intertwined air valves (2 smaller pumps versus 1 very strong pump = less EMF). Expect to pay a lot more for compressors with low EMF that will continue to deliver the same air force as when new even 4 years later. (I did not buy the extended warranty because if it's been proven to work for previous owners and not have a problem, why should I have to buy a warranty)? Ask your dealer if the pressure output degrades over time and at what rate.