Warning about the Aussie Heated Hose

It appears easy to order the wrong model:

-SMS wrote:
"SZ1 is the heated hose that works with Respironics and Remstar machines
(and others, too, of course.) SZ3 is the heated hose made specifically
for the Puritan Bennett machines because PB autopaps have to have an air
flow sensor tube running the entire length inside the main hose...the SZ3 has that sensor tube."

The vendor wrote to me:

"You can use the PB Goodnight sensor tube with other CPAPS simply by
tying a knot in the sensor tube ..... no problems

We allow more length for this." Carmen and Don Fischer

Since it appears to me that there is much interest in this product and
lots of you keep switching among different boxes, I just wanted you to
be aware of this subtlety.