I have a 2020 Phaeton. The DEF has been in the tank for a while and I’d like to drain it for a fresh start. Is there a drain cock on the bottom of the tank? I’d look myself but it’s in storage and I figured I’d ask here first.
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I’ve read that the Shaw systems have a drain plug. I don’t think any have a valve. But you can also just siphoned or pump out the contents. I use 1/2” clear tubing.
The vacuum pump reservoir units work great. Just don't use one of the tubes that is contaminated with another fluid. Use a dedicated DEF tube and I think a new one each year may be overkill, but I'm into overkill on DEF right now.
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