Need airlock for secondary?

[shoemaker27]

So I'd like to start a batch today but I would need to borrow the airlock from one of my secondaries I just placed (its in a bucket) after 8 days in primary. I looked at the airlock a good few minutes and theres no activity.

Could I just cover the hole of the secondary for a few days until I get a new airlock? Thanks for the help!

 

[eschatz]

sure, just sanitize some alum foil and put it over the top. bacteria cant go upwards, so they wont crawl up the sides of the foil. it'll be fine.

 

[weirdboy]

Personally I'd use foil on the primary, and keep the airlock on the secondary.