Just de-winterizing the 2010 Coleman Utah that is new to us and came winterized. There was a cold in/hot out bypass in back of gas hot water heater (in the front storage bin). In working to reconnect hot and cold located a single gasket...not in the greatest condition. Is a gasket required for both cold in and hot out? Available at the local hardware store? Also tried the shower - connection at base of hose at faucet leaking. Unscrewed and no gasket in there. Is there supposed to be a gasket in there? Available at local hardware store? Pics of the 'situations' are attached.