The present invention relates generally to a system for waterproofing a wall 7 having a wall opening through which a water combination 6 extends. The system comprises a sleeve 1 including a collar 12 having a resiliently flexible portion adapted to expand to fit about the water combination 6. The waterproofing system also comprises a coupling element 3 separate from the sleeve 1. The coupling element 3 is arranged to seal to the sleeve 1 and the wall 7 or associated tiles 8 to which the water combination 6 is mounted.