Universal Breathable Bung | CellarScience®

This CellarScience Bung has a ridge to keep it from getting sucked in and self-sealing vent holes to let air out but not in. They have a gentle taper, so they don’t slip out during use.  They are also very easy to clean and sanitize. The top measures 1.36" wide and the bottom is 1.89" wide. This is the perfect fit for a 1.5” TC fitting.