Windshield bag cap wanted

I have a '62 four door and I'm trying to set up the windshield fluid sprayer system the way it originally worked with the manual foot pedal. I think I have nearly everything except the cap to the red reservoir fluid bag that has the two connections. I believe it works with the tube coming form the foot pedal connecting to one (and it must has some sort of valve that keeps the fluid from being sucked back) and then a tube going from the other connector to the squirters under the front windshield. Does anyone have one of these for sale? I would gladly buy the whole bag if needed.

Thanks!

Jim