Metraman the fitting on the back is for flushing. Always start the motor before you start the water. If not you can fill your exhaust with water and if it gets high enough it goes in places you don't want. :rant:
devonte007 You sir are correct. NA and SC ski's both have open loop cooling for the exhaust. I don't know what I was thinking. Well I wasn't thinking! On the Groco I just found the water in from the pump and cut the hose and installed the Groco inline. I mounted the Groco so the side of the hull right under the rear storage tray. Easy to see and easy to clean. Personally I think it should be mandatory on a Supercharged setup. My buddies and I pulled our intakes and back flushed our intercoolers with coil cleaner. You wouldn't believe the crap that came out of them. We surely gained a one horsepower or two :thumbsup: If you do a google search there is a site that sells 4-tec performance parts that sells the exact Groco and all the fittings you need. We also installed ball valves on the same line towards the front of the motor so we could shut the open loop off incase we had to be towed. I'll get some pics when I get off work here in a few hours.
On the bilge I went with this pump. It is water sensing and doesn't kick off and on to check for water like the Rule's In other words it won't run your battery down. I mounted it in the back right next to the pump tunnel. Basically in the spot on the hull where the depth finder mounts if you have one.
http://www.amazon.com/SUPERSUB-Subm...TF8&qid=1383916666&sr=1-1&keywords=whale+pump
Just for kicks after I installed it I put a water hose in my hull and turned it wide open and that pump keep my hull dry.On the thru hull I mounted it high under the rear grab bar towards the side. Blends in and looks factory.