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Click on image for the lowdown. 
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| | | Forums66 Topics128,077 Posts1,056,019 Members48,433 | | 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: Dec 2013 Posts: 26 'Bolter | | 'Bolter Joined: Dec 2013 Posts: 26 | I can check a tank that I have to see for sure, but my guess would be that it is most likely a pipe thread in order to seal the hole tightly. I have a look at mine to see if I can determine a size.
Life is good on Windy Ridge!
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