You will wad up any pipe good before you break spigot bolts on a steel spigot.
About o-rings: Silicone hi-temp orings have poor abrasion resistance. Ever notice how they are worn flat from vibration and pipe movement? Buna N (common black rubber compound) is better but less heat resistant, and tends to retain its compressed shape. Viton is good but also not too abrasion resistant. I buy a big bag of Buna N o-rings and change them if I notice a leak. Its not a big deal.
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