A manually operable dispensing pump for use with a primary container containing a primary fluid, the pump having a body containing a sprayer mechanism and having a primary attachment means for attaching to the primary container and secondary attachment means for attaching to a secondary container having contents to be co-dispensed with the primary fluid. The secondary container is attachable by the secondary attachment means directly to the body at a location remote from the primary container. The secondary container has a holding chamber for holding selected contents and an outlet that provides immediate communication between the holding chamber and the sprayer mechanism when the secondary container is attached to the body so that contents of the secondary container can pass immediately into a mixing chamber in the body to be mixed with primary fluid pumped from the primary container. The mixing chamber contents are then discharged from the pump. Preferably, the secondary container is detachable. A detachable secondary container to be used with the pump is also disclosed.