Ac Infinity Backdraft Damper Ducting Insert - Black Galvanized Steel - 6" Root Aphids Most growers pour it into

Most growers pour it into the reservoir after the base A/B and any cal-mag

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Ac Infinity Backdraft Damper Ducting Insert - Black Galvanized Steel - 6" Root Aphids Most growers pour it intoAc Infinity Backdraft Damper Ducting Insert Black Galvanized Steel 6" The Ac Infinity Backdraft Damper Ducting Insert is a ventilation ducting tool designed for insertion into 6 ducting to prevent cold drafts and debris from flowing into ventilation systems. This product is made of sturdy galvanized steel and features two rings of outer rubber gaskets, which enable it to grip your ducting with an airtight seal in either a horizontal or vertical