I ran a Femco plug system this season and now I can answer this question myself. I put the Femco plug in my Morroso pan and will be taking back out this winter and replacing it with the stock plug. The ID of the Femco plug is so small, when you open the valve, it takes about 1.5 hours to drain 7 quarts of oil from the pan. This was not a good way to spend $100!