Abstract: The invention is concerned primarily with a piston action pump/syringe usable for veterinary work in particular (but not confined to this use) for the dispensing of metered doses of liquids or pastes, and includes a cylindrical body reciprocally housing a piston end of a co-axial plunger which extends outwardly from the body, the plunger and piston end having a common bore through which the body contents can be dispensed. The outlet end of the plunger, which is provided with a nozzle, has a novel one way valve permitting egress of the body contents and the end of the body remote from the plunger has a novel one way inlet valve for ingress of liquid or paste from a connected supply source. Preferably the invention includes an operating hand grip for the pump/syringe of one piece plastics construction.