Replacement Humidifer Chamber Question

I just received a replacement humidifier chamber from my SystemOne system. I contained two tops. One was a duplicate of what I had. What is the other one for?

I don't know what it's for, but you might want to keep it as a backup in case the cover you're using develops a crack or gets moldy... nearly impossible to replace just a cover, I would think.

That kit works with both the 50 series and the 60 series humidifiers. See this product page:

https://www.cpap.com/productpage/respir ... l-kit.html

"This kit comes packaged with the universal chamber bottom and two lids
to accommodate three different humidifiers in the PR System One line of equipment:
PR System One Heated Humidifier = Clear lid
PR System One 60 Series Heated Humidifier = Gray lid
PR System One 60 Series Heated Tube Humidifier = Gray lid "

library lady wrote:I don't know what it's for, but you might want to keep it as a backup in case the cover you're using develops a crack or gets moldy... nearly impossible to replace just a cover, I would think.

(1) I never throw anything away.
(2) If it's not meant for my model System One, could I do damage if I used it?
(3) The replacement "set" cost less than $20.