Blow off tube to mason jar

thingiverse

Two lids are integral to this project, and the barbs originate from the HoseBarb_1010.stl file sourced from the hose barb manufacturer. I utilize 3/8" ID silicon tubing, and upon printing this design, I will verify that it matches the required size. The first lid features two hose barbs on one side; one barb is connected to the blowoff tube fed directly from your fermenter, while the second barb on this lid connects to the second lid, which boasts a single barb on each side. The second lid attaches to the mason jar containing sanitized liquid and will be equipped with a short piece of tubing that links to the inner barb, trimmed so it nearly reaches the bottom of the mason jar. During fermentation, the first jar fills with CO2, which then flows into the second jar housing the sanitized liquid. Once fermentation is complete, you typically perform a cold crash to achieve clarity before racking to a keg or bottles. However, during this process, pressure changes within the fermenter can create a vacuum effect that draws sanitizer into the blowoff tube, contaminating your finished beer. This setup prevents such occurrences by redirecting any suckback into the jar connected directly to the fermenter, thus safeguarding your brew. Moreover, gases sucked back to the fermenter originated there, so contamination is not a concern. If you're unsure about this configuration, searching for "krausen catcher" will yield similar commercial solutions.