Motive Power Bleeder
I have one. They have a variety of means to attach to master cylinders. The best by far is the ones that fit these master cylinders:
Here is one during a bleeding:
The later model 2 bolt master cylinders made of plastic and aluminum use two screw on vented caps. The Motive bleeder attaches to one section, you use another cap to close off the other side.
For standard master cylinders like these:
They use this plate:
It has a rubber seal on the other side.
The flimsy hardware they include to clamp the plate down is ****. It sucks.
The plate will leak with more than 4 psi of pressure. You need a 15 psi pressure number to do the job. FABO member @1 Wild R/T posted this:
To seal off the plate, you need something better than those shitty J screws and chain.
Good luck.