Still Smarter

I anyone familiar with maturation soleras. Hopefully to be used for rum. I am particularly interestd in the hardware used for transfer between the levels.
Any advise will be much appreciated.

I am trying to build up stock for a solera system. Both for rum and for eau-de-vie.
I have 3 of 20 litre oak barrels. These are intended to be the final stage before bottling of Rum, Eau-de-vie and Whisky.

All will be solerafied (is that even a real word) The way I am doing it is:
Stage 1. Initial aging is in glass demijohns with oak blocks (home made)
Stage 2. Further ageing in 30 litre stainless kegs
Stage 3. Optional - Blending / Ageing in 50 litre keg
Stage 4. Finish in a 20 litre oak barrel.

Every time you take a bottle out of the oak barrel, you refill the barrel from Stage 3. Then refill Stage 3 from Stage 2, and Stage 2 from Stage 1.

You can have as few or as many stages as you like. Dependent on your facilities, and how deep your pockets are.

On a small scale you just need taps. I modify new 30 litre kegs for the purpose like this. If you are commercial - or a really heavy drinker - you might want a small pump. I have one on my spirit boiler because I use it to pump out backset/dunder for re-use.
It is a small magnetically coupled pump I have plumbed into the boiler drain. Easily copes with boiling liquids. Good bit of kit. https://www.brewbuilder.co.uk/ts5-mini-mag-pump.html

Having resorted to a quick Google, while it is intriguing, I don't believe that I have the space.

Robert.