I have acquired a dry suit that never had valves installed. My buddy picked it up a couple of years ago but some how "shrunk" and he can no longer use it. The valves came with the suit but there are no holes in it. I can see how the valves would be installed, but is there anything glue or sealant that need to be applied? Some of the neoprene suits I have seen have a circular rubber disk around the neoprene, some do not. Other than marking the locations, cutting the hole, and screwing the valve down is there anything else?