Specs ~8″ Diameter Glass HopperPlexiglass caseVacuum LidDescriptionHere is a glass funnel/vacuum hopper with a plexi-glass case and lid. These were used with wafer growth furnaces, but can be refitted to a number of other applications. The funnel/hopper itself is glass and the cylindrical vacuum chamber is polycarbonate/acrylic. The lid seals for a vacuum environment. They are guaranteed to arrive as stated with a 30 day right of return.