On the SDR35 pipe you used, I was not clear if you used the solvent weld fittings or the ones with gaskets. It looks like you used solvent weld fittings, but is the solvent weld tight enough to avoid vacuum leaks?
Yes, those are unglued solvent-weld fittings. As far as I can tell, the joints seal up completely just from the friction-fit. If not, the leak is so small that it wouldn’t affect anything.