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78F350, great pics, but the function of each part is a little off. I have used similar push-to-connect fittings for many years at work, this is what each part does-
- the black part (vacuum fitting to manifold) is simply an adapter. One side connects to the engine, the other side is sized to fit into the push-to-connect fitting.
- the light gray fitting (brake booster hose) is the push-to-connect fitting, and that's where all the magic happens. As you pointed out, there is an o-ring on the inside that seals around the vacuum fitting. There are also sprung metal or plastic fingers that retain the mating vacuum fitting in place. If the push-to-connect fitting is working properly, you push until the fitting stops (this action collapses the sprung fingers, and allows the inserted tube/hose to slip inside the o-ring). You then pull straight back to "lock" the sprung fingers in the extended position, keeping the tube/hose from sliding out when there is pressure.
- the dark gray part (clip) is inserted in the gap to ensure that the push-to-connect fitting does not accidentally get pushed downward, potentially releasing the tube/hose.
Hope this is helpful.
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