Originally Posted by bikendan
i wonder when FR made this change. my '07 23SS has a drain T-valve, next to the FW tank.
i simply pull it up and the tank drains. when it empty, i push it back down.
no cap except where to fill it.
I have that on the freshwater tank too - but you also may have a low point drain elsewhere, the lowest point of any pipe/hose on the trailer so that you can drain out every drop of water. You need to do this before winter (so nothing freezes), after winter (to remove the antifreeze) and after sanitizing the system (to get out the bleach).