#6.5 Bored Bung
Rubber or silicone
The rubber bung width is 27-34mm and the height is 25mm
The silicon bung width is 22-38mm and the height is 48mm
It is bored with a hole the right size for an airlock.
This bung will fit the 5 litre carboys we sell as well as most modern 1 gallon or 5 litre carboys / jars / demi-johns and some larger ones