The temperature indicating cap is what makes the Dynavap magic. This is the same cap that is included with every model, if you have lost your cap or otherwise need a replacement this is what you need.
Great Experience as usual
Delivered in time, great product, trusted company.
My Dynavap M lost its heating click. Only had the M for a few months. Rather than claim a defect. I ordered 2 new caps. 2 days and they were in my mailbox. Nice!