Perfect fit, really easy to order.
The ResMed replacement parts I ordered worked perfectly. I tried off-brand replacements, but none of them worked; they leaked and I felt like I was not getting the right amount of pressure with the other parts. With ResMed parts, my mask works great - no leaks! Absolutely worth it. The ResMed shop site is also really easy to navigate and I trust that the parts I'm ordering are the right ones for my system. No confusing options.