I'm wondering if the insulated mugs, specifically the 48-22-8396R model, are completely dishwasher-safe. Can I just toss all the parts in the dishwasher without worrying about damage?
2 Answers
I've been putting mine in the dishwasher on the top rack a couple of times a month for over a year now, and it’s held up really well. No issues at all! So, I’d say they’re pretty safe for the dishwasher.
Technically, no. Any cup with a vacuum seal can be harmed by the heat. It's better to just wash it by hand to keep it in good shape.

But isn't the 48-22-8396 a screw-top? Doesn’t that make it more durable?