How To Make A HAMP

Just wanted to give you guys a video on how to make a HAMP.
High, Air pressure, Manual, Pump.

By the way I forgot to tell you in the video. That at the end of the plunger rod you have to glue a cardboard circle that will match the size if the hole. It is used to block air from coming out of the plunger rod.
It should look like this.
I also added electrical tape around it.