Hi Forest,
On my '78 I got a valve that allows you to by-pass the water heater. To winterize I would turn the valve , open the water heater drain valve and then circulate RV anti-freeze through the system. Check with Camping World if your 93 is not equipped. It should be near the inlet side of the water heater. There is also a one way valve that must be installed as well.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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