The vent plug is a pretty Starboard specific piece of hardware.
I do not know about any shops in Dubai that would have the
vent plug on hand, but I did find a UAE national distributor:
Ph:1 989 785 0375
If you have no luck getting a replacement vent plug from
Shamal sport, come back here to the Starboard forums and
I'm sure we can find a way to have a new plug and O'ring
shipped to you.
Hope this helps,