Rain Cap (010) - Single Wall Condensing flue (all fuels) - 100mm (4")
Twin Wall Stainless Steel All Weather Cap - Ø 100 mm 4 Inch
4 Inch - 90 degree Tee & Cap [TSWP-CVIT-BPEN-D100-A90T] - £126.14 :
4" Rain Cap - Flue Liners (Woodburners) - Fluesupplies.com
Amazon.com: 4 Inch Galvanized Steel Rain Cap - Round Roof Chimney Cap - Vent Roof Cover - Rubber Gasket for Best Fit - Moisture and Hot Air Exhaust - Metal Flue Cap : Tools & Home Improvement