IHPSV4.5SC | Storm Collar | SV4.5" and 7.5" Concentric Vent | IHP570440201SKU:77L81-1Inventory ID:03611724Select Item:Price: $32.00Quantity: Storm collar is installed on top of the flashing. Caulked should be applied between collar and pipe. SV4.5SC venting component is used on some Astria, Superior, and Lennox gas burning direct vent fireplaces. Check your model's Installation Manual for listed Secure Vent Components. Reviews Choose your rating12345