In developing the GTCHB Vessel Line, Global Filter listened to the results of a broad market study, conducted by the company in 2009. Features incorporated into the line include heavier wall thickness for a more robust unit; improved lid sealing by using the optimum lid profile; DOE/222 Universal Cups as standard on all GTCHB vessels; all units accept 2.5 inch wound and melt blown cartridge in addition to 2.7 inch pleated cartridges; and legs as standard on all units.