If your sessions with the Pulsar RoK portable dab rig aren't as pleasant as they were before, a good chance is that you need to replace the air path tube.  Since it is the main pathway through which the vapor travels, a dirty tube might aggravate coughing or simply compromise flavor and vapor quality. 

This original replacement air path tube from Pulsar is the solution to that.  Buying the official replacement ensures exact fit and the same Pulsar quality you already know and love. 

This set contains two easy to replace, stainless steel tubes, so you'll always have a spare on hand if the one you use breaks or gets too dirty.