is blended the apparatus comprises a relatively small transfer vessel which is connected through a shutoff valve to the liquid for receiving a gravity flow of liquid therefrom and an air compressor for pressurizing the transfer vessel through a pressurized air conduit a check valve installed in the transfer vessel adjacent the liquid inlet of the vessel prevents the trasfer of liquid from the vessel back into the supply when the vessel is pressurized an electrically controlled valve in the pressurized air conduit enables an associated control unit to control the flow of pressurized air into the vessel when the vessel is connected to the source and is unpressurized liquid flows from the source into the vessel through the check valve pressurization of the vessel by the compressor then closes the check valve and forces the liquid contained in the vessel out of the vessel and to the other location an elevated loop in the pressurized air conduit prevents liquid from the liquid supply or the vessel from flowing into the compressor a corresponding process is provided for transferring a liquid in discrete amounts or 34 slugs 34 from a liquid supply to another location application_number US 51208590 A description there is schematically depicted in the drawing a volumetric liquid transfer apparatus 10 according to the present invention by way of illustrative example volumetric liquid transfer apparatus 10 is connected for incrementally transferring molten sulfur in specific known relatively small amounts or slugs from a delivery tank truck or other delivery vehicle 12 to a pug mill 14 wherein as described below the molten sulfur is combined with asphalt oil and aggregate to compound batches of a material suitable for paving roads parking lots and the like located beneath pug mill.