I received my overflow box yesterday and am pumped to get everything set up. However, I have been reading Eshopps mods to keep it quiet when transfering water to the sump. But I've noticed that Eshopps has added what looks to be an air tube glued to the PVC downpipe, along with two foam inserts. My question is where do the two foam inserts go? It seems as if they go into the pvc drain tube, but i would think it would restrict flow, or get logged somewhere. :shock: Also with the bulk head does the O-ring go on the outside of the box when installed?