Thanks, I just did it again by pouring from a measured container, this time using the correct line on my container.....( I think I was shorting myself about a pint on each pour from the last test). I have to get rid of some of this 30 year old kitchen equipment that is barely readable....in combination with my 58 year old eyes i guess.
It seems the marks on the bubbler are pretty close, but I marked it myself at the 5, 5.25, and 5.5 gal levels. I want to make a slightly larger than 5 gal batch to make sure I get a good 48 bottle batch this time. I also have a couple of growlers handy if I need one.