Oatey 12805 Roof Flashing, 1/2-Inch-2-1/2-Inch, Black Sidewall flashing is designed to seal around piping penetrations through outside walls Designed to seal around piping penetrations through outside walls Slips easily over vent pipe - self-sealing to vent pipe surface Self-sealing elastomeric collar attached to a durable flexible hard plastic base Collar will not crack, chip, peel or separate from base