If you know where the tank is and can get to it, look there. Ours has a nice big 1 inch ball valve mounted at the tank. If you don't see it there, look in the wet bay. Not there, then look underneath the rig. It could even be boxed in making you have to remove a panel to get to it.
And while I doubt this is the case, I suppose it's possible yours might not even have a drain valve.
__________________
03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E
|