I have used these washers for quite some time and they always fit the hose perfectly and stop leaks. I usually replace my hose washers each spring. These sometimes work better than the washers that come with spray nozzles.
Most of my friends throw out hoses when they no longer maintain a proper seal. I never understood why, in almost every case replacing the washer fixes the problem. The rubber washers wear out and should be replaced annually.
These are perfect. They are affordably priced and they work. I use them every year to replace the washers on my outdoor hoses, sprinklers, and everything I connect to them. I've never had any issues with them, and keep a few on hand in the event I have a faulty seal or need a quick replacement.