An adapter for switching the fluid uptake port (P1) of a manually operated fluid-dispensing pump (P) between a plurality of fluid reservoirs. The adapter has an adapter outlet port (12) in fluid communication with the fluid uptake port (P1) and at least two adapter inlet ports (11). The adapter has concentric outer (13) and inner (16) housings. In a preferred embodiment, the outer housing (13) is affixed to a plurality of fluid reservoirs. The position of the outer housing (13), which is manually rotated with respect to the inner housing (16), is determined by a spring-loaded detent. Rotation of the outer housing (13) through successive detent stops sequentially connects the fluid uptake port (P1) of the fluid dispenser pump (P) with one of the adapter inlet ports (11) which are adapted to be in fluid communication with fluid reservoirs.
