Brake bleeding plug

[peabodyracin]

Am I wrong? I thought some time ago I'd seen a plastic plug to screw into a proportioning valve for when you're bleeding the brakes (68-9 b body projects). I've got two cars with new valves installed and want to finish off the brake systems, but can't for the life of me find out where you get one of the plugs.

Thanks in advance!

 

[MCODECUDA]

The last time that I did a complete rebuild on my brake system I just gravity bled them.

 

[steve340]

I made one on the lathe years ago. I am certain thread is either 5/16 or 3/8 UNF
I just turned a little "tip" on an old bolt.

 

[old guys rule]

Do Master cylinders usually come with them customer