CPVC to Copper?

1990’s mobile home with CPVC supply plumbing. All of the shut off’s are copper or plated copper. To my eye the joints appear to rely on the same cement that the cpvc joints use. Are these allowable joints? Will they be prone to failure?

Thank you in advance for your input.

perhaps this.

https://www.plumbersstock.com/files/xref/large/607.jpg

Under the second picture and it seems to be Teflon’s tape sticking out,Micheal’s right about the the other fittings

Mike… Does the union in your picture utilize cement. (is that a piece of cpvc inside?)

Yes it does.

Can’t tell from you pic just what you have.

Thank You!.. I just did not like the look of them. I suppose that just seeing one that looked odd would be more concerning. Since they are all the same it makes sense that they came that way from the factory.

If you look closely you should be able to see the CPVC insert.