Appreciate it Joe…Will give it a shot!To clear the blockage without damaging the drain hose, use water hose and push water in from outside drain. The blockage will move inside then drain will start to work. It will block again, repeat until all the debris had cleared. Wash inside with pressure water hose. Wash the chain and the storage each time you return from anchoring.
Got it to flow/drain using a plunger. I'll clean out the locker and snake the drain shortly. Appreciate all the input! TYMight be useful to use a wet shop vac. Trying to get all that debris out that little vent will take a while. It's all organic so you can empty the vac canister overboard which will speed up the process.
Clean vent = drainage.