Expansion tank pressure tester adapter

[CorvallisBMW]

Does anyone have the necessary threaded adapter for using a pressure tester on BMWs? I need one, but I'd like to avoid buying one for $50 if I'm only going to use it once. They come in Harbor Freight kits like this

http://www.harborfreight.com/radiator-pressure-tester-kit-69258.html

And also as stand-alone parts like this

http://www.etoolcart.com/bmw-expansion-tank-adaptor-vz22.aspx

I'd rather borrow one if anyone in the area is willing to loan it??

[e30austin]

You can borrow my whole pressure tester if you want it.

[Farbin Kaiber]

The Harbor Freight one sucks donkey balls. I once bought that same kit before they color coded it, it was worthless on a BMW, worked on a Pontiac, and other domestics, but not the BMW caps I attempted, including e28, e30, e36, and e46.