About the easiest way to dry hop with pretty much no oxygen. Just add your hops to the bong, pressurize and purge with the PRV, pressurize the bong one last time to a higher pressure than the fermenter, and open the butterfly valve to drop the hops in. No more fussing with magnets, timing your dry hop and hoping the yeast scrubs oxygen, or keg hopping. You can also use it to add gelatin, purée to sours, just about anything you can think of (just clean it well!) The hop bong also has lots of other cool uses as well (see Kegland's video on YouTube, Key shows a bunch). Also, if you have multiple Fermzillas, you only need to buy this entire kit once. Otherwise you can just buy the lid with the Triclamp fitting and a 2 inch butterfly valve, and just swap your hop bong around as needed. The only downside is the price, it's actually more expensive than the actual All Rounder, but it's super worth it in my opinion and will last a lifetime. Cheers!