It's funny how everyone recommends BP rotaries even though they were the first to start leaking and we still see topics about them leaking pop up from time to time. The only rotary fittings I don't recall seeing a "help, my rotaries are leaking" topic about are Koolance. I could be wrong on that but honestly, I really don't recall seeing any "leaking" topics about them. If I'm wrong, please link me.