| 摘要 |
A water heater comprising a tank defining a water chamber and having an outer surface, a spud mounted on the outer surface, a jacket surrounding the tank and having an inner surface spaced from the tank outer surface, an opening aligned with the spud, a margin around the opening and converging inwardly toward the tank, insulating material between the tank and the jacket, and a fitting threaded into the spud and having a tapered outer surface which engages the margin to form a seal against the insulating material.
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