Used with any series of VacuFlush vacuum pumps, this heavy-duty tank stores the powerful vacuum force that evacuates the toilet bowl with every flush. Highly sensitive vacuum switch – monitors vacuum level and activates vacuum pump when vacuum level drops due to flushing. VACUUM SWITCH AND CAP NOT INCLUDED !!!! Flexible installation – can be installed horizontally, vertically, or suspended from ceiling. Heavy-duty construction – impervious to corrosion. Includes installation hardware – clamps, cradle for floor or wall mounting. 1-1/2-inch (38mm) hose fittings. Picture shown is for spec only.