Fits #6 stopper and 38mm screw cap
https://amazinggrainshomebrew.com/collections/equipment/products/drilled-rubber-stopper-6
https://amazinggrainshomebrew.com/products/38mm-white-metal-screw-cap-pack-of-four
Fits #6 stopper and 38mm screw cap
https://amazinggrainshomebrew.com/collections/equipment/products/drilled-rubber-stopper-6
https://amazinggrainshomebrew.com/products/38mm-white-metal-screw-cap-pack-of-four