6-7 Gallon Carboy Stopper Retainer

thingiverse

I needed a clamp to secure my stopper and airlock in place while fermenting in my 6/7 gallon carboy. I discovered ones that fit perfectly around the hourglass neck of my 5-gallon vessel, but couldn't find any that matched the threads, recess, and lip on mine. My larger carboy is equipped with a threaded neck, a slight depression, and a raised edge. This clamp slips onto it with a reassuring click to keep the stopper and airlock from shifting out of the fermenter.