As Hankpage pointed out, these "winterizing valves on the inlet side of the pump" are not usually found in RV's and you can buy kits that are easily installed. From your post, I wasn't quite sure which valves you were referring to. Keystone is not alone in not providing them as standard equipment.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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