Booya, I'm trying to make the pumping colunm. I wasn't really trying to up grade to the 1/2 line, I'm only recirculating 2 5 gallon buckets, thats just what fit on the tee fitting I had. It's a 1/2 stright fitting with 1/4 od. as the tee off. Does it have to be in the shape of a y or would the tee work? I think the bubbles might be to small for the 1/2 line. Thanks for your help.