All standard CPAP masks (non-proprietary or non-specialty masks) and tubing are compatible with the Z1™ and the Z2™. 

Our tubing comes in two different sizes 4 feet and 6 feet slim style. They are 15 millimeters wide.  You can use standard tubing with the Z1 and Z2, which is 19-22 millimeters.   The diameter of the HME is 15 mm on one end and 19 mm on the other end.