Ok, i just bought this 1975 Glastron V-178 Bowrider...I've just been looking at things and i notice this water inlet in the hull...it's about 1/3 of the way back the boat from the bow and it's on the Port side, it travels inside the boat and terminates in the floor of the Bow seating area on the Port side...What is this? Was there a plug that went here...doesn't make much sense to me, though i know theres a purpose. Thanks!