Originally Posted by wret
You could use a Yamaha type petcock. You'd only need to tap the screw holes or use use sheet metal screws with a good grip.
Thanks for all the great info. This solution seems to be the easiest though. I mean just cut a hole and drill the addition screw holes right? I would like to avoid brazing and messing around with solder. Iím assuming this would be mounted on the bottom of the tank with the tubes (filters?) in the vertical position. The one seems pretty long...how does it work?