The thing is, on FGF you don't need a recovery bottle if ALL stock/correct parts are in place. If a stock system is puking, it's because there is too much water/anti freeze in the system. Once it pukes out the access, you should be all set. I know in my bird, the water level was down 2-3" as stated above. If I filled it more than that, it would puke out what it didn't need and that was it....
