I have used the brass ebay versions and they don't last more than 6 months. The ebay ones corrode and have a small diameter. The o-ring is on the outside and easily tears. The Adam's version is huge and has the seal on the inside of the fitting. The knurled fittings make them easy to install and connecting and reconnecting is super easy. I knew I would love these so I put them on anything I had that needed a garden hose connection for detailing. Works great on the pressure washer (2.0), the deionizer, and collapsible hose. No leaks at all! They do cost twice as much as the cheap ebay ones you can find made of brass, but I'm sure these will last more than twice as long and are easier to use.