The 2.5" Adhesive Monotub Filters are designed to cover standard 2-inch monotub holes, offering a fast, reliable solution for maintaining passive airflow and high humidity in mushroom fruiting chambers. These filters simplify your setup while supporting consistent, clean conditions for colonization and fruiting.

Made from high-permeability filter media and backed with a strong adhesive layer, they install in seconds—no stuffing, taping, or extra tools required. Just peel, stick, and grow.

Each pack contains (24) 2.5" Adhesive Monotub Filters.