This is a joint for a 2" elbow underneath a unit-shower (in Japan.) The elbow is a special type which is clear, and using a blue glue shows the glue line so you can insure you have a good joint. An example of a good seal can be seen at this link -- Fitting mfg. product page
My guess is that the shower manufacturer requires the contractor to use this type of fitting because the joint is impossible to repair once the shower room is installed and assembled. The contractor was crappy, and I threw him off the job, but now I see that the plumber he used may have been questionable also.
From the photo, you can see the glue seal on the bottom half of the pipe (the photo is rotated so to the right is the slab, and to the left is the underside of the shower floor.) There also appears to be a thin line of blue at the very end of the pipe, so my guess is it does not leak. The silvery patches mean there is an air gap between fitting and pipe.
There is no seal at on the top half, and even the bottom half looks sketchy. I plan a leak test on Monday, but my real concern is that with future stress (temblors, temperature, age,) the thin line will crack and water will forever seep out.
So, does anyone know if this would be considered a satisfactory PVC joint? I can find very little on the web, I think mostly because this type of fitting is not too common, but what I do see says that with such poor coverage the joint needs to be redone.
To redo it, I need to disassemble the shower (several says of work) but I have not built adjoining walls and floors so I want to do it now if it needs to be done.
Thanks for any advice.