The Aquatec 900 is the complete toileting aid. The seat height can be adjusted to 6cm,10cm or 15cm (2",4" and 6") so that the toilet seat height can adjust as your needs change. The armrests provide valuable support when getting up and down from the seat. The Aquatec 900 mounts to the toilet using the same mountings as a normal toilet seat. There is also a separate lid to maintain a familiar feel.