I used these D-rings on my Mavrek 1 tubes behind the back rest to be used to secure a coler, drink bottle, safety line or other gear to take along on a float. Look and work great. I found installation was fun and easy.
Bottom Line Yes, I would recommend this to a friend
Orca is hypalon. Hypalon does not bond well to PVC. It is chemically very inert, has a very high melting point, and cannot be "welded". NRS sells a number of PVC D-ring patches. You should use one of those and PVC cement.