These Ts or splitter could be bought new from auto parts shops, I've seen similar splitters used for water pipes which are for windscreen sprayers. Rather telling you need for turbo lines, just ask T or splitter for water sprayer.
The round thing is non-return valve. They are also available as new, but you'll have to take a picture and show to shopkeeper to get it.
You can find both of these in used parts market as well, Sher-Shah or Shafiq Mor used auto parts market.
These vacuum and turbo lines impact petrol average greatly, as these are connected to petrol pressure regulator as well as turbo waste gate. Also, turbo will not work until these are connected correctly.
Lastly, check Idle Speed Control valve, I've described its working in following video. If ISC valve is not working correctly, you will notice performance issues as well as bad fuel average.
Hope these answered your questions. Best regards.