Abstract: A manually-actuated fluid dispenser pump including a pump body (10) and a piston (50) mounted to slide in leaktight manner in the pump body (10) between a rest position and a dispensing position. The piston is provided with a top sealing lip (52) in leaktight contact with the pump body (10). The pump includes an abutment member (80), fitted into the top edge of the pump body (10) and co-operating with the piston (50) to define its rest position. The top lip (52) of the piston (50) is made up of a first lip portion (53) co-operating in leaktight manner with the pump body (10) and of a second lip portion (54) co-operating in leaktight manner with the abutment in the rest position, and wherein the first and second lip portions (53, 54) are substantially parallel and spaced apart radially from each other.

Abstract: A manually-actuated fluid dispenser pump including a pump body (10) and a piston (50) mounted to slide in leaktight manner in said pump body (10) between a rest position and a dispensing position, said piston being provided with at least a top sealing lip (52) in leaktight contact with said pump body (10), said pump including an abutment member (80) such as a ferrule, fitted into the top edge of the pump body (10) and co-operating with said piston (50) to define its rest position, said fluid dispenser pump being characterized in that the top lip (52) of the piston (50) is made up of a first lip portion (53) co-operating in leaktight manner with the pump body (10) and of a second lip portion (54) co-operating in leaktight manner with said ferrule (80) in the rest position, said first and second lip portions (53, 54) being substantially parallel and spaced apart radially from each other.