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500P | Aladdin Universal Plastic Light Ring Adapter SP1070P Collar Extension Chlorine DPD Testing: Measure bothThe Aladdin Universal Plastic Light Ring Adapter 500P is a versatile retrofit accessory that lets you upgrade or replace an outdated pool light niche with a modern standard light without rebuilding the niche. Made from rugged ABS plastic and molded with a built in grounding strap, this adapter ring fits many older metal or hand formed niches (roughly 9 " to 12" inside diameter) and expands them to accept common pool lights from major manufacturers.