`SIVAC` is the Vacuum Sewer System named after 2 Japanese owner companies SEKISUI CHEMICAL Co., and ISEKI POLY-TECH, INCORPORATED. The companies acquired Cowel (UK) in 1991, and successfully modernized their technology & products up to date. SIVAC system was provided to clients thoughout the word, with the brand name of SIVAC in Japan, and with the brand name of ISEKI outside Japan. SEKISUI and ISEKI were separated them ISEKI POLY-TECH was bankrupted in 199X. Ever since then, SEKISUI had been continuously modifying their valves, and SEKISUI decided to deliver the SIVAC system to the world, since 2005.