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doesn't solve your problem, but i'm grateful for atkiman's reminder of why I no longer have a husband!

Mine's older than yours but there's two electrical connections and one bit where a pipe slots onto a tube on the outside of my camper. I imagine a very powerful pump would produce the same effect and a very small jubilee clip might hold it in place. is it possible that someone has upgraded to a pump that is stronger than the original?

What sort of water heater do you have, and what sort of connection is on the outside of the camper?  This will depend upon the fitment needed to attach... if it is a whale system you should have something like http://www.whalepumps.com/rv/product.aspx?Category_ID=10006&Product_ID=7&FriendlyID=Watermaster

If it is a carver heater then you should have http://www.towsure.com/product/Carver_Thames_Water_Pump_w_Hose

the 'plug' that fits into the camper varies on each of these, where as the actual water pump that fits into the barrell is very similar. 

Hope this helps