1.  You can see the layout of the pumps in these few pictures. The pump closest is the out pump, note the check valve. Without this spring loaded valve, the water would siphon out. When the pump turns on it forces the valve open, pumping the water out of the tank.

2.  The pump on the far side pumps water into the tanks through a screened in hole on the bottom of the hull. This also has a check valve to keep water from siphoning out. ( Valve not shown, not built yet ). It's simply a weighted flapper valve.

3.   The check valve for the out pump is pretty straight forward. I found household copper piping worked the best. #1 The 90 deg elbow that fits flush with the pump discharge pipe. #2 A sleeve slides over the one end of the 90 deg elbow , and is soldered together. #3 The spring to hold the valve shut. Connected to the #1 90 deg elbow and #4 valve. #4 The valve that slides in and out of #2 sleeve. #5 Is simply a cap that will fit flush with the hull bottom.  

4.   Pump mounting plates - water pickup plates. Above is the in pump, not the screen and the slots covered up. This allows the water to be drawn in from underneath, not the sides. Below is the out pump. Note the slots are open and cut down about 25%, with no hole in the hull bottom. This allows more water to be drawn in from the sides because the pump is lower.  

5.   Below is the pump system mounted on the hull bottom. Note the Check valve in the down pumping position.  

   6. Below is a diagram on this system. Electrical and mechanical layouts. You may also download this in a large format. For further instructions:

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