An airtight flexible cap with two sealable holes, for fitting a Carboy Siphon Tube in one hole, enabling you to start a siphon by blowing in the other hole. Fits our 5 gallon carboy and our 5 and 6 gallon PET plastic Better Bottles.
You can be the first to ask a questions.
Carboy cap
The fit on the carboy neck is too loose. I got no action in my airlock. I solved the problem with a hose clamp.
Leaks
I've been using these caps (though the the kind I've been using has a thermoprobe attached and I've noticed that I get no action in my blow off tube while fermentation is going on. I suspect that it leaks around where it wraps around the carboy bung. However, I've never experienced infections from this or anything to that nature. It does the job well enough.