I would like to know if the hex plug just forward of the centre fin is a drain plug?
Just spent the last 9 days surfing and paddling daily and noticed it is a little heaver in the back end when carrying down to beach.
I was going to take the plug out but thought I best get some advice first in case it is not a drain plug.

Thanks in advance.

That looks like your fin retaining screw.... not a plug. Sups usually (but not always) have vent plugs... not "drain plugs", that should be tightened before getting in the water.... its not normal for water to get inside.. so you have to look into that if you have a leak somewhere ) dings or cracks? Or perhaps you were just getting fatigued after 9 days of water work - and everything probably feels heavier as time goes on.. :DGet in contact with the manufacturer perhaps? I think they are made in Newcastle - a fairly small outfit?