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Gibraltar Building Products 6-1/2 in. x 7-3/4 in. Foam Vent Plug (2-Pack) DVBP - The Home Depot
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Ventilation plug, M10, brass, 9 l/h, IP68 @ Morek
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Metal Breather Vent Plug,Waterproof Breathable Air Vent Plug,Stainless Steel Waterproof Ventilation Gland,Brass Breathable Screw Vent Plug