The term Vari-Level refers to the fine adjustability of the height of a grating or access cover above a body; this feature enables installation exactly at finished floor level by rotating the grating or access cover.

A Vari-Level gully comprises, as a minimum, a Vari-Level body and a Vari-Level grating; in some versions these items fit together directly, but, mostly, connection is by means of an inter-connecting, dual-purpose part – a membrane clamping collar. To address a myriad of applications, different versions of Vari-Level bodies are available for use with a wide range of Vari-Level gratings, Vari-Level access covers and Vari Level accessories.