gravity type. Depending on    requirements, System A and/or System B can be used, details of    which are clearly marked in the toilet compartment. When operating    System A, depress lever and a plastic dalkron eliminator will be    dispensed through the slot immediately underneath. When you have    fastened the adhesive lip, attach connection marked by the large    "X" outlet hose. Twist the silver coloured ring one inch below the    connection point until you feel it lock.  