I was tightening one of the bolts under the hood for the passenger side strut and I slipped off the wrench and punched this thing and broke it. When it broke it let out a hissing noise like it was pressurized or something. Looks cheap but I don't know what the heck to ask for at the store, or what it even does.

Looks like some sorta valve. Its located right by the PCM. 95 Lt1 Trans am if that makes a difference

 

that is a two way check valve for your vacuum reserve bottle and HVAC selector switch. Here is the part you need
http://shop.advanceautoparts.com/web...ve+-+universal

 

If it were me, i would have ended up punching some with at least 2 more digits in the price. Lucky break!

 

ever slip off a bolt and hit a bmw fan?...

 

I'd be more worried about all the work involved with getting to the fans. Don't you have to take off the bumper and a fender? lol

 

not on the car i worked on... LUCKILY...

i know on say a audi a4 with the 1.8t motor that in order to do a water pump and timing belt the entire front clip but the fenders come out...