Part Number: 4DFS-MS
eFireplaceStore Item Number: CPF-21003
It is incredibly important for you to use the proper materials when relining your chimney, so stick with a name you know you can trust. This Mortar Sleeve by DuraFlex is designed for use with the DuraFlex UltraPro 4" chimney liner pipe, and is available in 4", 5", 5.5", 6" and 8" sizes. The sleeve is constructed of sturdy stainless steel, and is OMNI listed to UL 1777 and ULC S635 (43-P-02-2).The actual diameter of the sleeve is 1" larger than nominal diameter.