I bought two old King Kegs from Ebay for around £25 each and fitted Corny posts and a floating dip tube. Very happy with the results. Have been using them much more than my Fermzilla.
I've even been able to collect yeast from very heavily dry hopped beers (300g / 20L) without any hops making it into the storage jar. I do this by swirling the hell into the fermenter before crash cooling to get the yeast into suspension. The hops fall out first and the yeast settles on top of that. After I empty the keg, I simply scoop out the yeast using a ladle.
In short, I'm getting the same benefits as my Fermzilla at a fraction of the cost. The only thing I miss (slightly) is that it isn't transparent.
Here are links to all the parts if any of you fancy giving it a go. Pics are attached too.
Corny posts. Take both gas and liquid. Designed hold a floating dip tube:
https://www.aliexpress.com/item/3300335 ... 4c4d0P8kkU
Floating dip tube:
https://www.aliexpress.com/item/4000594 ... 620f12ef-2
Blanking plug as the S30 valves on the King Kegs I bought were removed:
https://www.screwfix.com/p/flomasta-blanking-plug/472fy
I used a bit of silicone on the posts. No washers. Just tightened them really tight. Holding pressure no probs.
Happy brewing
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