This blow off barb is great for homebrewers who are fermenting their favorite brews. Whether you're using an FTSs Lid or a Brew Bucket/Brewmaster Bucket Lid, it's the ideal accessory. It has a 1/2 - inch hose barb, which is a common size for easy hose connection. The barb is made of 304 stainless steel, so it's durable and long - lasting. You'll also get 2 gaskets, a lock nut, and 2 o - rings (1 for use and 1 spare). It fits into the blow off or airlock hole of your fermenter lid without any hassle.