CMI DVBPSM Vent Block Foam Plug, Foam, For Lawrence, Vent-Air, Norwesco Vents

Constructed from foam, lightweight and easy to install or replace seasonally, includes a pair of pre-attached vent plugs, help reduce utility bills, designed to fit snugly within the cavities of Lawrence (Sku # 810-4903), Vent-Air (Sku # 810-4911) and Norwesco (Sku # 117-0182) design block vents (not included).