Hey there!
It is my understanding that the company Huben Power offers a Notos Z Block type regulator and plenum as well as other Huben Power PCP and Paintball Products. The Actual manufacturer of the Huben Power Products is Dongguan Xianma Electromechanical Co., Ltd.
The issue is some knockoffs are being sold on eBay, Alibaba, and other outlets that are fakes/knockoffs that Dongguan Xianma Electromechanical Co., Ltd, does not manufacture.
My contact at Huben Power states that they do not sell on eBay, Aliexpress, or other retail eCommerce market places.
To be clear, the manufacturer Dongguan Xianma Electromechanical Co., Ltd uses Huben Power as its logo and symbol.
Now what I think I'm reading here is that Dongguan Xianma Electromechanical Co., Ltd is also making and selling to others at a discounted rate, that I am not certain of but, I have purchased some of the other Aliepress and eBay units for testing and consideration. In my testing, it was determined that there were carbon steel internals that were rusting and blocking airways and internal ports, I had 6 out of 10 gauges leaking, and failing, degassing ports were leaking. Most communication attempts were not responded to in a timely manner or not responded to in a way that aligned to the issues presented, so I cut my losses and moved on.
I see there is a substantial price difference between the Aliexpress part and the Huben Power part but Huben Power has provided all documentation and provided a level of support that has convinced me that they are the real deal.
I will be exclusively using the Dongguan Xianma Electromechanical Co., Ltd / Huben Power Products in any of my offerings.