There are some physical characteristics one should assume prior to engaging in plumbing projects aboard a boat; including, but not limited to, the strength of Sampson, the wisdom of Solomon, and the patience of Job. Having three hands would help too, and Gumby's spine. Changing intake valves on a boat is like performing in Circus de Soleil. There are many places on a boat that you can see, and that you can touch, but not at the same time. So your hand is in one compartment, turning a fitting with a wrench, your head is in another compartment, upside down, watching what your hand is doing. Forget knowing which way to turn or leverage, those concepts don't exist on a boat. Anyway the ball valves are in, the thru-hulls are tight; all I need is a little bottom paint and I am ready for a splash. Oh, I installed the batteries and started the engine, it runs perfectly. The easiest thing I ever did, (since Cindy Macaluso in ninth grade,) was winterizing my boat.