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As Bill says, that plastic part is a baffle for your vent.I've never seen anything inside them so I'm not sure what would have blown out when you blew air in it. Possible some dirt build up?

I've attached a picture of your valve body. Looks good but the adjuster for the pressure regulator looks crooked. Is it just the angle of the picture? I've highlighted the area in red.




I have had many of the vents off there is nothing on the inside, had to have been dirt or something

70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4