Re: 1990 Suburban .....Code 42 Help
I would say you are correct. Pretty sure they are installed "dry". Since it is pipe thread, it seals itself.
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72 GMC C2500 402/Th400 first truck (still have)
77 GMC C3500 CC dually Sold 
70 C50 dump truck "Rusty"
87 K10 Suburban Sold
93 K2500 xcab 6.5TD
96 GMC K2500 Suburban 6.5 TD
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