Compression packing seals or gland seals are deformable materials used to prevent or control the leakage of fluid between surfaces that move in relation to each other.
O-rings are solid-rubber seals that are shaped like a doughnut. When pressed between two mating surfaces, O-rings block the passage of liquids or gases.
Switch boots protect switches from contaminants such as dirt, dust, gas, and liquids. They are generally tough, pliable silicone rubber devices for toggle, pushbutton, rocker and rotary switches.