I'm a little confused. Are you referring to the valve of your gray tank that holds the dirty water from your sinks and shower, or the valve to empty your fresh water holding tank? If it's the gray tank, refer to the post above. If it is the fresh water tank, you might be able to find the valve at a hardware store. May have to contact an RV dealer or winnebago.
2013 Itasca Sunstar 26HE
Firestone Airbags, Hellwig front/rear Anti-Sway Bars,
Rear Trac Bar, Safe-T-Plus, and 480 watt solar system.