What size wrench turns the brake bleed screw on 2011 Equinox?

Any suggestions on how to loosen it?

 

I was going through the forums just looking at topics. Saw this and figured you probably already found the answer. But, I'll provide my $.02.

I have 2007. Removed the rubber cap completely. Able to stretch the ring around the bleeder screw to completely remove and then put back on. Used a socket wrench to break open bleeder screw. Turned screw by hand while bleeding. Tightened again with socket and returned rubber cap.