My brother is trying to switch to vaping but he hates box mods, so he picked up an e-pipe a few weeks ago. This 'PIPE 618'
He has not been happy with it, when I tried it, it didn't have any flavor and barley any vapor. I thought I'd switch the carto and give him my old herakles tank (I know too airy to use) or kayfun, was gonna screw on the kayfun v3 mini to it when I noticed kinda strange looking connectors on the pipe and carto that comers with it.
Left to right pipe, Carto and kayfun connectors.
From what little notes came with the pipe and some research, it is my understanding that this device doesn't have any kind of protections. And because I'm not familiar with these connectors with holes in the middle I thought it might not be prudent to use any other atty on the pipe and thought I'd better I ask someone more experienced, better than to short or vent the device and batts. Is anyone able to help? any info will be appreciated.

He has not been happy with it, when I tried it, it didn't have any flavor and barley any vapor. I thought I'd switch the carto and give him my old herakles tank (I know too airy to use) or kayfun, was gonna screw on the kayfun v3 mini to it when I noticed kinda strange looking connectors on the pipe and carto that comers with it.

Left to right pipe, Carto and kayfun connectors.
From what little notes came with the pipe and some research, it is my understanding that this device doesn't have any kind of protections. And because I'm not familiar with these connectors with holes in the middle I thought it might not be prudent to use any other atty on the pipe and thought I'd better I ask someone more experienced, better than to short or vent the device and batts. Is anyone able to help? any info will be appreciated.