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Click on image for the lowdown. 
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Global Mod,
Mod | | | Forums66 Topics128,096 Posts1,056,478 Members48,444 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jan 2008 Posts: 4,962 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,962 | It was quite common to replace this valve with an air valve back when these units were still used as trucks. All it does is shift one way with vacuum and a spring shifts it the other direction. | | |
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