Looking for an AIR injector bypass valve, part #12550930. This is for a 1999 Chevy K2500 Big Block

 

Rock Auto has three brands of the AIR bypass valve for your 7.4 liter Chevy K-2500:

https://www.rockauto.com/en/catalog/chevrolet,1999,k2500+pickup,7.4l+v8,1353383,exhaus t+&+emission,air+/+smog+pump+check+valve,4912


I hope I never see an A.I.R. smog pump in my life again. My old man's 1969 C-60 used to go through those things like crazy.
Of course, that old truck was in the dirt and dust, half the time, so that didn't help too much.

 

See my post on this at:

https://chevroletforum.com/forum/199...99/#post360623

 

this is the picture of the valve I need.

 

I couldn't find that part anywhere. Never seen a unit
like this on an AIR system. You may have to try a wreaking yard to find this part. It seems to have been discontinued.