Product Info Catalog HVAC Ventilation Louvers, Vents & Turbines 6-1/2x8-3/4 Foam Plug 6-1/2x8-3/4 Foam Plug Request a Quote UPC: 736223157398 Manufacturer: Construction Metals Inc SKU: 517607 Model Number: DVBPXL 6-1/2" x 8-3/4", Large Foam Plug, For Norwesco Foundation Block Vent, Each Plug Splits In Half For 1 Pair To Function On 1 Vent.