I'm having trouble connecting the collapsible travel hose to the QTube on the Z2 machine. Both the collapsible tube and the QTube have hard plastic ends, so even though they fit together it's not a tight fit like you get with a hose that has a soft plastic end, and they just slide apart. I feel like...

I bought one in mid-July from smallcpap.com. The website says "Due to market conditions, we have a delayed response time" but I got mine in a matter of days.