What is this for?

[Billnsue]

Just purchased a 1998 Winnebago Vectra Grand Tour and found this trap door in the hall closet. Some kind of a tank plumbed.

[cbeierl]

I don't know which model you have, but you should be able to find the Plumbing diagram for your coach at this site: Winnebago Plumbing Diagrams

I suspect that it's a tank for RV AntiFreeze as part of the built-in winterization system.

[Billnsue]

That’s exactly what it is! Thank you for sending me to the plumbing diagrams. Thank you!

https://www.winnieowners.com/forums/attachment.php?attachmentid=174861&stc=1&d=1599083 518[/IMG]

[BobC]

I'll bet that the function is described in the operator's manual, which is also available via Winnebago's website.