Backdraft Damper - Spring-Loaded One-Way Airflow Valve pH Perfect Grow includes compression nut and gasket

includes compression nut and gasket

The plant is healthier and the overall results with Fish Sh

Just fully saturate the wool with a pH 5

Powerful bait that is highly attractive to slugs and snails

Backdraft Damper - Spring-Loaded One-Way Airflow Valve pH Perfect Grow includes compression nut and gasketPrevent reverse airflow and protect your ventilation system with this professional grade spring loaded backdraft damper. Engineered with high quality steel and lightweight aluminum, this one way valve ensures air flows in only one directionkeeping bugs, odors, and contaminated air out of your grow room when fans are off. Why You Need a Backdraft Damper When your exhaust fan shuts off, negative pressure can draw outside air, bugs, and untreated odors