This natural rubber 4 hole stopper from Anvil Brewing has four holes that accommodate the Anvil Cooling Coil, the Anvil Thermowell and an airlock. It has one 9.5 mm hole, two 5.7 mm holes, and an 8.5 mm hole. It works great as a replacement in the Anvil Cooling System if yours goes missing or becomes damaged.
| Brand | Anvil Brewing |