I bought everything on ebay uk. for fast shipping. But there's a lot of sellers from China. With the same standards.
Just look for the standard quality.
Stainless Steel A4 or 316/316L (Regular Stainless Steel is A2 or 304)
From SS 304 or A2 standard all is "Food grade". I researched a little...
I modified the cooling chamber with Stainless Steel A4 or 316L marine-grade parts and G5 titanium, which were more specialized than the A2 or 304 grade steel used in the original cooling unit. Even the beads cooled faster and had a higher degree of anti-corrosion than glass beads.
M2.5 x 30mm...