Here's how I'm "assuming" the female coupling on the hose that connects to the male portion at 12:00 is assembled. This is how it was done on medium duty trucks of same time. I don't know that I would want to tamper with the items 15 - 18 in this image. I'm researching it a bit more for you.
Have you or are your intentions to remove the complete housing to remove the remnants of your nipple that's broken off?
[IMG]
[/IMG]