Although I want to add sprinkler heads (a la Zandor), I haven't done it yet...I use the same size rubbermaid that you do, maybe 2 gallon...I am very happy to say my clone/bubbler just showed me my first clone root tonight...I did it a little different, I cut 2 holes for 5" netpots, then drilled 1" holes in the round cutouts, put bubble stones in the netpots, the rubber plugs w/cuttings in the cutouts and set them in the netpots, it bubbles like crazy right below the clones, and now I know it works, I'll keep you posted on my success rate..so far 1 rooted out of 14! yeehah...happy daddy, latewood