Rubber plug for bubbler 120.
It is used for attachment of the bubbler to the wooden barrel. It allows good sealing.
After removing the bubbler, we can put a cap on the hole.
Made of ABS.
Cone diameter:
Size nr. 1 bellow 22 mm/ on the top 38 mm.
Size nr. 4 bellow 50mm/ on the top 65mm.