A valve assembly for a fluid delivery system for aspirating liquid from a bottle. The valve assembly includes a valve housing for insertion into the neck of the bottle, an elastomeric valve and an elongated tube. The valve housing has a primary bore and a secondary bore which extends at an angle to the primary bore. The elastomeric valve has a head portion which lies in the primary bore and a flexible neck portion which lies in the secondary bore and which contains a socket. One end of the elongated tube is located in the socket of the flexible neck portion so that the tube extends through the secondary bore and into the interior of the bottle.