This stainless ring is the HUUM DROP embedding flange. It covers the bench cut when you sink a DROP heater-only unit partway into the bench. Not a safety rail (that is Rail D). Not a STU package extra — STU pkgs on this shop stay without this add-on; the flange is not in those cartons, we still only offer it on heater-only DROP.
How it is used
HUUM: at least 375 mm / 14.8 in of the heater must stick up above the bench. Use this flange to cover the cut rims. Fits DROP 4 / 6 / 7 / 9 heater-only.