Wall Thimble - Small, 58DVA-WTS.  Provides a complete wall-pass-through and firestop. Use with Round Horizontal Cap, Sconce Cap and H2 Horizontal Cap only.

DirectVent Pro is a unitized, coaxial (concentric) venting system designed for use with direct vent gas or propane stoves, heaters, and fireplaces. Materials and Construction .020” aluminum inner wall. .018” galvanized steel outer wall. Painted outer walls made of laserwelded .018” galvalume steel. Caps also available in stainless steel and copper. Outer pipe brings combustion air to the appliance. Inner pipe exhausts flue gases to the outside. Gaskets or sealants not required (unless specified by the appliance manufacturer). Clearances Specified by the appliance manufacturer. Diameters 4” x 6 5⁄8” and 5” x 8”.