[KeelHaulin]

I see a problem with what you propose. Filling the fresh water tank might be difficult without enough height drop from the fill hole to the tank. If the height is too shallow or if the hose is not sloped downhill enough the water will "back-up" in the fill line not allow the tank to fill.

If you switch the hose for the deck fill you will want to replace the deck fill hose over to the sanitary system type of hose. If you can't get to the deck fitting from below deck you might be able to unscrew the deck fill from above and then pull the hose out to disconnect.

 

[KeelHaulin]

There are new fittings which require a winch handle to open the fitting; check to see if your locker will accomodate a winch handle. Then you have two different tools required for filling the water or pumping the head. Or if you went with plastic fittings you could have one colored green and one black or red for the pumpout.

Another concern for the fresh water fill up in the bow is failure of the seal on the deck fill. Since the anchor locker will get water splashing in in rough conditions; it's possible that it could be submerged in salt water now and then; allowing salt water to leak into the tank if the seal ever went bad.