Lost my foam stopper

[BillyRaygun]

Hello forum,

I'm making a 1000ml yeast starter and lost my foam stopper for my flask. Is it safe to use my blow-off preventer? Or is there another best method until I can order a new stopper?

Any advise would be appreciated.

Best Regards,

 

[IslandLizard]

Loosely crimp a piece (5x5" or 6x6") of aluminum foil over the flask's neck/opening.
I've always done it that way, never used foam stoppers.

BTW, what's a blow-off preventer?
What volume is that flask? I hope it's at least 1.5 liter for a 1 liter starter.

 

[Ozarks Mountain Brewery]

https://www.amazon.com/gp/product/B091HTNF72/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

 

[beren]

I use paper towel with a rubber band and just hit it with starsan every day or 2

 

[govner1]

Loosely crimp a piece (5x5" or 6x6") of aluminum foil over the flask's neck/opening.
I've always done it that way, never used foam stoppers.

BTW, what's a blow-off preventer?
What volume is that flask? I hope it's at least 1.5 liter for a 1 liter starter.

The aluminum foil is the answer. Remember to spray it with Starsan.
You shouldn’t need anything else unless you’re trying to do a 1 liter starter in an erlenmeyer less than 1.5-2 L

 

[BillyRaygun]

Loosely crimp a piece (5x5" or 6x6") of aluminum foil over the flask's neck/opening.
I've always done it that way, never used foam stoppers.

BTW, what's a blow-off preventer?
What volume is that flask? I hope it's at least 1.5 liter for a 1 liter starter.

@IslandLizard - This worked perfectly. I sanitized the exterior of my flask, and aluminum foil and ended up with a very active yeast starter. Fermentation in the primary is doing very well.

Sorry - when I said blow-off preventer, I meant air-lock

 

[IslandLizard]

Looking good! ^

Sorry - when I said blow-off preventer, I meant air-lock

You wouldn't want an airlock on a starter vessel unless you're streaming in air (or O2) into the flask or directly into the starter beer.
Yeast needs oxygen to grow/propagate.