Rob, my Excella also had the single handle by-pass set-up, and it also failed. Inside the metal box to which the handle and pipes are attached is a system of valves that carry out the function required. My enquiries indicated that spares were not available to renew the parts inside the box. I therefore junked it, and replaced it with the usual "two plastic diverter valves and short hose" system available in a package from RV stores for about $14. I would recommend that course of action to you.
Nick
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Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."
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