I did the same thing TangoBlue did.
I was able to find my pump on sale for about 1/2 price. They are a little pricey, but worth it. The pump runs smooth and almost effortlessly.
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Here, you can see it tucked away in a corner in the teardrop.
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What parts are required for this and where can they be found? The link to Northwest Overland that Tango posted is dead...