http://www.aquatuning.us/water-cooling/tubing/anti-kink-spring/3761/knickschutzfeder-einzeln-13mm-100mm-lang?c=6577
This place has a big selection of different sizes.
That's awesome to get the size (248) for the Speidel 30l. I'm ordering some now.
Regarding other o-rings, I have used McMaster-Carr site and followed the part number info on this post: https://www.homebrewtalk.com/showthread.php?t=233086
Did not get to connect with any home brewers but did hit some brewpubs there. Here's some links if anyone else is going to Kiev:
http://schulz.ua/glkiev
http://www.tripadvisor.com/Restaurant_Review-g294474-d3692406-Reviews-Solomenska_Browarnia-Kiev.html...
We had figs and habanero peppers in the garden... Figanero beer was born. Used a recipe for Dunkleweiss and then added 5 lbs of figs and 3 habaneros (deseeded) that I had pan roasted and then pureed in a vitamix before adding to the last 20 mins of boil. Then I diced 4 habaneros and covered...
I'm going to be visiting the Ukraine end of Aug / Beginning of Sept 2015. Would love to connect with you and see your setup. Understand there's some brewpubs there that may be worth checking out?