So I played with it,and when I did I found it hard to attach the cap unto the reservoir with a long hose attached to it.
My initial try with the white metal unit would of worked but it is not an M connector for the quick connect so since I had M connnectors I swapped it for the M gold coloured and the 1/4 to 1/8 reducer is on the inside of the cap and the threads hold the small piece of tubing.
You can see the quick connect is now in the cap and you now screw the cap on the reservoir, and attach the hose via the quick connector which is going to the pressure tank. Btw, the cap has enough extra hose to leave the fluid below the fill mark when your done with the bleed. As per Gordo, (I could adjust the height to perfect level, on the day of)
This makes even easier than the Manufacturered cap they sell for $40 
