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Message: <blockquote data-quote="NatD" data-source="post: 6669977" data-attributes="member: 100900">Hello.   I have 2 of these for each of my 1” returns, which will come through the top of my overflow weir.  I’ll be pushing about 1200-1300 gph through each.  I just read in another thread that the tops of them need to be 3/4” below the water line.  My initial thought to accomplish this is that I’ll need to notch out the weir a little lower and have my returns not quite as tall.   Alternately , simply cut a 1” circle in the overflow where the return comes out, push the return through, and attach the RFG on the other side.   Should I be drilling a siphon break if I do either of these?  Where?</blockquote>