It works great I boiled in it I chilled in it there was no problem

Good quality glass! Makes an excellent starter!

This is what you need for your larger starters. It works well and can have hot wort cooled directly in ice water.

This is what you need for your larger starters. It works well and can have hot wort cooled directly in ice water.

This flask is so much better than my last one. It's made from thick Pyrex and this guy is HUGE! Perfect for extra large starters for 10 gallon lagers. This is a bit overkill for 5 gallon batches but it's perfect for when you need to grow a ton of yeast.

This flask is so much better than my last one. It's made from thick Pyrex and this guy is HUGE! Perfect for extra large starters for 10 gallon lagers. This is a bit overkill for 5 gallon batches but it's perfect for when you need to grow a ton of yeast.

Good addition to my flask collection especially when doing larger starters.

Good addition to my flask collection, especially when doing larger starters.

I'm extremely happy with this 5000 ml flask. It it is of a high quality and I have no fear of it breaking without the exception of my own clumsiness. It is huge beautiful and I got it at a very fair price.

I'm extremely happy with this 5000 ml flask. It it is of a high quality and I have no fear of it breaking without the exception of my own clumsiness. It is huge, beautiful and I got it at a very fair price.

This is for those BIG yeast starters and it works great!

This is for those BIG yeast starters and it works great!

I bought a 2000ml flask first but wish I'd gone straight to the 5000. This one is big enough to make any starter you'll ever need and then some. In fact I've started doubling my starters so I can harvest half to keep yeast on hand for strains I use frequently. I boil directly in the flask on my glass top stove and transfer directly to an ice bath in the sink no issues. If you do boil in the flask you'll need a few drops of fermcap-S to prevent boil overs

I bought a 2000ml flask first, but wish I'd gone straight to the 5000. This one is big enough to make any starter you'll ever need and then some. In fact I've started doubling my starters so I can harvest half to keep yeast on hand for strains I use frequently. I boil directly in the flask on my glass top stove and transfer directly to an ice bath in the sink, no issues. If you do boil in the flask you'll need a few drops of fermcap-S to prevent boil overs

Excellent product for excellent price...

Excellent product for excellent price...

It works great I boiled in it I chilled in it there was no problem

It works great I boiled in it I chilled in it there was no problem

Excellent! And thank you to the customer service team for awesome service!!

Excellent! And thank you to the customer service team for awesome service!!

The size of this thing is mammoth. It is just what you need to for yeast starters for high alcohol brews. It would have gotten 5 stars but there are bubbles in the glass in certain areas which means I have to boil the malt in a pot before transferring the hot liquid to the flask. I don't want it to shatter. Small inconvenience in my mind.

The size of this thing is mammoth. It is just what you need to for yeast starters for high alcohol brews. It would have gotten 5 stars but there are bubbles in the glass in certain areas, which means I have to boil the malt in a pot before transferring the hot liquid to the flask. I don't want it to shatter. Small inconvenience in my mind.

This is the Mac Daddy Flask. Big beer plans need a big starter. A gallon on the stir plate makes it happen. Discounted 1 star for the graduation marks at 4 & 5 liters being off by quite a bit.

This is the Mac Daddy Flask. Big beer plans need a big starter. A gallon on the stir plate makes it happen. Discounted 1 star for the graduation marks at 4 & 5 liters being off by quite a bit.

For the price this is an excellent 5-liter flask just the thing for huge yeast starters. Be warned though that the volume graduations are not accurate at least not on my model. The 2 000 mL mark is spot on but others are not. I wouldn't discourage potential buyers from getting one of these if you just need a big affordable vessel to contain a starter but know that you can't trust the graduations on the side. Use a scale and you'll be fine though.

For the price, this is an excellent 5-liter flask, just the thing for huge yeast starters. Be warned, though, that the volume graduations are not accurate, at least not on my model. The 2,000 mL mark is spot on, but others are not. I wouldn't discourage potential buyers from getting one of these if you just need a big, affordable vessel to contain a starter, but know that you can't trust the graduations on the side. Use a scale and you'll be fine, though.

I mean it works great. When you want the flexibility to make starters of any size just get a 5L.

I mean, it works great. When you want the flexibility to make starters of any size, just get a 5L.

Very useful and arrived as promised

Very useful and arrived as promised

Works as intended. Building up a starter right now. Great for 10 gallon batches

Works as intended. Building up a starter right now. Great for 10 gallon batches