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Use "watertightness" in a sentence
"In order to meet product requirements such as watertightness and resistance to corrosion and extreme temperatures, liquid silicone was chosen for the pump geometry and seals."
"Governors are far more used to being slightly out of control, and living with it, than Senators, whose campaigns, staffs, and messages are built around watertightness, instead of true seaworthiness."
"All imperfect rivets were cut out and replaced and the watertightness of the shell was tested by filling the gate leaves with water."