Low Power Radiator Fan Eco Energy Single Double Grill Top & Convention Heaters 5030017085580 | eBay
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A1E220000001DC00 - Radiator Accessory: Top Grill Clip Pair for Type 22 Radiators (2 pieces) (VN Code: A1E220000001DC00) - Ke Kelit NZ Ltd
A small plastic square on the top of a new radiator, it can slide back and forth but doesn't seem to serve any purpose. There's one on every radiator in the house
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