I bought a 1" NPT thread. It's perfect for ball top kegs and Fermonster bottles. I suspect it would also work on Big Mouth, Fast Ferment and Spiedels Bubbler will fit but I would recommend confirming your vessel's dimensions first, I believe the 3/8" NPT size will fit Sanke kegs and regular bottles like higher quality bottles but do some research to confirm this beforehand To confirm purchase I will say the dimensions of the spray ball were as advertised I hooked it up to a 1/3hp submersible pump I took the build to the next level by adding valves and small lines with male connectors This allows me to connect short lines to the keg with ball lock couplings and clean the dip tube while cleaning the keg turn off the water supply to the spray ball and re some with it the kegerator lines. This spray ball is a cleaning machine. My bottle's ruffled ring happens to get the strongest jet from the spray ball. I really like the cleaner overall and this incredibly cheap spray ball is a big reason why. Overall, I spent about the same amount as I spent on the popular air purifier kegs and bottles, and I think it's more versatile and does its job better.
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