English to Dutch Tech/Engineering Electronics / Elect Eng Immersion heater

Ik heb geen flauw idee wat in de volgende zin met "bite olives" bedoeld wordt:

This will enable the element to be pushed through the flange enough to expose the two ***bite olives***.

Het hele stukje waarin dit voorkomt is:
Remove the top nuts from the two mechanical fittings (using special tool Extended Reach Socket Spanner) securing the element needing replacement. This will enable the element to be pushed through the flange enough to expose the two bite olives.
Cut through the element between each olive and the flange, enabling the element to be withdrawn back through the flange and baffle assembly.
he new element should be checked electrically before fitting using two new olives and following the reverse procedure. Note that the internal sharp edge in the olive should go on first and ensure that the ends of the new element protrude through the flange by the same amount as the other elements.

Alvast hartelijk dank voor alle suggesties.