OMS P-ValveP Valve One of the best things a diver can do to be prepared for a dive is to be adequately hydrated. Optimal hydration requires begins 12 24 hours before the planned dive. As your dive time increase you become gradually more challenged with how to remain hydrated. Part of the process of staying hydrated and being comfortable underwater is having the ability to urinate. The OMS P Valve has been developed from feedback provided from divers with years