Hot Water Heater drain valve problem

[AlaTex]

Hot Water Heater drain valves are leaking on 2000 Coleman/Fleetwood Mesa.  They appear to be 1/4" barb on each side of valves (can only see outlet side).  One red tube for hot water and one blue tube for cold supply.  The valves have a barrel valve with four "O" rings (2 sizes) in each valve.  Difficult to find proper size O-rings.  I have previously look for o-rings at several places with no luck finding correct size.  

I would like to replace orgional valves.  Has anyone had problems with similar valves?  If so, what did you fix them with?  Also what size is the pipe?  Looks to be about 1/2" OD.  ID could be either 3/8 or 1/4 inch.  Once I remove valves I would like to have replacements ready to install.  

Leaving day after tomorrow on 6 day trip to Great Smoky Mts. (Elkmont).  This is not a good way to start trip.  May just cut pipe above valves and plug with bolt and clamp untill return.

[tlhdoc]

I am not sure what size the tubing is.  Contact Fleetwood or the service department of your dealership to find out what size the tubing is and if your dealership has replacement valves.  I am guessing that the valves are closed all the way.  Good luck on the trip.  We were camping just outside the Great Smokey Mountain National Park this summer.  Have a great time.