A tight enough ring should have no trouble stopping the urine. That actually seems easier to me than maintaining the erection. So you need to find the right ring, there are a number of them. However, some of them are designed to press with lower pressure on the urethra, probably to allow ejaculation for the non-RP crowd, which might be less effective for stopping urine.
But if you are not able to get an erection with a pump that is good enough for penetration, and assuming you can tolerate the whole pump scene(I can not), consider two of whatever rings you are using. With a pump, I can get hard enough for anything, even too hard actually, but often one ring will not maintain it long enough. Two rings, for some strange reason, do the trick with ease.
Also, if once you slip the rings on you are still not quite hard enough to suit you, I have found that- with some practice- it is quite possible to slip the pump back on over the rings and pump up some more, Then the 2 rings will usually keep for me whatever I end up with. It's a heck of a lot of trouble, a royal PITA, but sure does achieve what might be called a bone.
You might also want to look into injections, with or without a ring for extra help if still needed. Unlike with pumps, I have never been able to get quite hard enough with trimix, for some reason, but many guys can. Besides the injections might be better for your rehab, if they don't give you Peyronie's. Oh, and injections will be no help with urine control, so you will probably still need a ring.
Post Edited (BillyBob@388) : 6/15/2015 1:56:59 PM (GMT-6)