AN APPARATUS COMPRISING A SEALING ELEMENT

摘要

An apparatus, comprising a first part arranged to receive a second part; and a sealing element disposed between the first part and the second part and in contact with the second part, the second part arranged to be moveable relative to the first part and the sealing element, wherein the sealing element comprises a wear indicator, and the first part is configured such that the wear indicator is visible external to the apparatus in normal use.