I've picked up a decent 7mm wetsuit (Parkway Poseidon), used. It has/had a chest valve. The valve itself is missing and so hole is there in the chest all the way through. I assume I can use suit if I don't mind water coming in there. I assume I don't need to worry about replacing valve. Can I just patch or plug it, or just leave it open. I'm not sure how/why these valves were used anyway on these wetsuits. Can anyone fill me in. I didn't start out as a cold water diver. Any info, thanks. This is not a dry suit.