One of my planes has the Dubro valve in it. Works great. The only thing I don't like is the extra plumbing inside the cowl. It can be a bit awkward to reconnect when putting the cowl back on. I've got another plane with the three line setup. So far, I like that better. What I like best is that there is a more direct path between the tank and engine. Less chance of something plugging up or a fuel line falling off. I didn't bother with a fuel dot, just left the fuel line hanging out the bottom rear of the cowl a bit. I plug it with a screw. Can't get much simpler.