What’s the green piece sticking out of intake manifold (I think)? 2008 Mazda6

2008 Mazda6 2.3L 5 speed automatic, engine and transmission has 130,000 miles both.

if you look directly under the red ring around the hose, you can see a green piece sticking out. it will go inwards when the engine is on, to the point where you can't see it. and irt will pop out, and you can hear the air, after engine shutoff. couldnt tell if it was normal.

I've had a leak of some sort, I believe. I've inspected all of the hoses I could. this is the only thing I could find. is there supposed to be a hose connected to this?

(it is going to the shop Monday).

there's no lights, codes, pending codes or any of that. I've checked the short term fuel only, and it was negative at idle. around -3.00

no check engine light, no codes.

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