Help finding heated tube adapter/coupling for Dreamwear

Hi! I am a new cpap user. I have the Dreamstation HT15 heated tube. I just bought the Dreamwear nasal mask but it doesn't fit into the end of my heated tube because the elbow adapter is too small. There is some kind of adapter that fits into the end of the HT15 tube and I've been trying to find it online. I find ones that look like they may work but Im not completely sure it is the right adapter/coupling. Does anyone use this combination and know what the model number of this little adapter I need? Thank you so much!!!

where did you get the mask .. it comes with the elbow with the white swivel

https://www.cpap.com/productpage/pr-dre ... -pack.html

look through the images of the mask and you will see the elbow

YES, thank you! I just found that out also. The adapter is missing from the one I received. I am going to call the company tomorrow! Thank you