The problem is that the piece Teacup showed you WILL NOT fit the e-nano heater cartridge/stem. He was simply trying to help you understand the difference between the male/female ends on glass, and used the pic of that adapter as an example for you. I took a closer look at my e-nano stems. They are thick walled, so too big to fit my 14mm j-hooks natively, and too small to fit my 18mm j-hooks natively. The SonG, GonG options that Epic sells specifically connect the e-nano to j-hooks and water pieces with 14mm or 18/19mm female joints. And the dedicated WPA are shorter and easier to use to connect your e-nano to a j-hook, helps reduce stress that can lead to breakage to these fragile glass pieces. If this does not convince you to give the Epic WPA a try, there’s a dedicated j-hook thread on here you can check out for more help. Good luck man.