Broken sealing screw Alphacool Eisstation DDC reservoir

[edoardoz]

The plastic sealing screws of this reservoir keep breaking (they crumble over time), and I would like to replace them all with chrome ones. I already get replacements 2 years ago. The issue is with the 3/8 screw for the filling; I can't find any chrome sealing screw in that size. I was trying to look online to see if there's one that would suit my needs, but the problem is I don't know if it has the correct threading, the right pitch, etc.

I need help please.

 

[Pampersfinn12]

G3/8" has given values. There is no different size, just conical and cylindrical. I recommend cylindrical (has an o-ring).
You could could cut off one on a lathe. Alternatives usually have G1/4" (fitting with temperature probe or a rgb diode (long or short, one of them has epilepsy cycle).
You could buy a random stainless steel stop fitting G3/8" without nickel plating and polish it to mirror finish, if you can't find a chrome plated one.