Round Chimney Rain CapRound Quick Connect Chimney Rain Cap features a stainless steel mesh screen and wind guard. The wind guard does a great job at keeping out rain and wind during a driving rain. Fasten down the quick connect clamp to the collar of the flex liner Top Plate or Chase Cover and you're done! In a tornado your roof will come off before this tears off and it installs in a snap! Note: This cap is designed for use with a top plate or a chase cover with a flex