Many of us have invested in Motive power bleeding products to do the one man brake bleed.

Instead of reinventing the wheel and buying an entire coolant pressure testing package with 10 adapters that you'll never use, where is the one adapter that fits our e60 coolant expansion tank (and screws into the Motive plastic hose). See below.

 

Buy a cap and threaded barb fitting.
Drill it out,tap it, teflon tape on threads and maybe JBWeld for good measure.

 

Also, put a Scrhader valve on the Motive tank so you can charge it with shop air rather than spending 2 hours pumping that little pump.

 

 

The pressure part of the cap is the necked part with the two o-rings. Drill and fit the barb in the center of the area that says '200'. Make a clearance hole in the top part of the capfor the hose. The pressure portion snaps out of the cap portion.