After trouble shooting why my macerator wouldn't pump, I determined the discharge through hull ball valve is inoperative. Specifically, although the handle and shaft turn with some resistance, the ball does not and remains in the closed position. So, since I have an overboard discharge and a pump out service, it isn't a big problem. I have seen how a diver put a toilet plunger over the intake in order to replace a though hull instead of having a short-haul. That prospect makes me a bit concerned since I think it's going to take some serious work to get the ball valve off. Has anyone done that? The valve in question is dead center in the photo with the handle bent for clearance. (Please, no nagging about ball valves, "proper" through hulls, etc. This lasted 26 years in the worst possible environment, so an Apollo is going back in.)