Secure Vent, 4.5/7.5 Vent System, Coaxial Rigid Direct Vent, 36" Straight Pipe: 77L73

Coaxial 36" Length, Rigid Straight Pipe 4.5"ID x 7.5"OD.

This is used for Lennox, Superior and Astria Gas Fireplaces that call for Secure Vent 4.5/7.5 Vent System.