Superior 10-Pack Rigid Horizontal Firestop for Secure Vent 4.5/7.5 Rigid Vent SystemWhat's Included Horizontal Firestop Features Use to maintain the proper clearance when passing the pipe through a combustible wall For use with Superior Secure Vent 4. 5 7. 5 Rigid Vent System (4 1 2 inch inner diameter and 7 1 2 inch outer diameter) Note: This does not come with clamps. They will need to be purchased separately. Specifications Item Number SV4. 5HF 10 Catalog Number H2246 Product Type Horizontal Firestop Quantity 10 Pack