Option 1 (simple & clear):
Your Luna TravelPAP includes a 15mm breathing tube and is compatible with both 15mm and 19mm tubing.

Option 2 (polished):
The Luna TravelPAP comes with a 15mm breathing tube and supports the use of either 15mm or 19mm compatible tubes.

Option 3 (compact):
Your Luna TravelPAP comes with a 15mm tube and works with any 15mm or 19mm breathing tube.