It really is just one hole. I tried drilling two holes in my initially tube, but then the airflow was too huge. It felt weird, I had to seal it. Thanks for the responses Teamleary & Skooby. Let me know if there's any typos or crappy language. English is just https://howtomakedmtvapecart10260.luwebs.com/33365381/copyright-carts-vs-powder-usa-for-sale-an-overview