Abstract: A portable vacuum investment casting apparatus includes a box-like housing having an upper generally flat supporting wall with a vertical conduit terminating in an opening in the top wall. A vacuum conduit is connected to the vertical conduit and terminates in an outer sidewall in large and small conical connectors to receive a conventional shop or household vacuum cleaner hose. A manually adjustable valve is connected in an exhaust pipe from the vacuum conduit for controlling the vacuum level. The apparatus is powered from a conventional household type vacuum cleaner device or similar fan unit which establishes a relatively high air flow with a relatively low vacuum. A small vacuum gauge tube is mounted on the front wall adjacent to the vacuum setting control. The top end is connected to the vertical conduit and the lower end has a supply tube with an adjustable end member to set the initial liquid level.