So I am thinking about setting up a gravity fed top off and need to find a valve that I can mount in my sump without drilling anything. If anyone has one or knows where I can find one please let me know. I saw a couple online for $30-35. Seems a bit high to me. My goal is to have a 5 gallon bucket as a reservoir that feeds the sump thru 1/4 tubing. Thanks in advance!