spill ring

ring louver,

(Brit.) spill ring In lighting, a louver system in the form of concentric annular rings; used in luminaires having circular apertures.
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Easy to Clean - Removable stainless steel weighing platform, sealed front panel and molded spill ring to
With a sealed front panel, molded spill ring, and stainless steel platform, the balance provides protection against spills and features an easy-to-clean surface.