Patent ID: 7973255

Claim:
A switch comprising a generally tubular housing, and a dome member having an annular rib extending from the base of said dome member, the dome member being disposed within said housing and being elastically deformable in use, said housing having an inner annular groove for receiving said annular rib of said dome member, said inner annular groove having a relatively sharp edge which corresponds to an intersection between said annular rib and the remainder of said dome member, wherein said housing is provided with clamping means which are movable from an open configuration in which said dome member can be introduced into said housing, and a sealed configuration in which they substantially cover the base of said dome member so as to clamp said annular rib of said dome member within said annular groove and create a fluid-tight seal between said housing and said dome member, characterized in that the relatively sharp edge of the annular groove corresponds to a substantially v-shaped groove which defines the intersection between said annular rib and the remainder of the dome member.