Quick view Blocksom Roof Drain Filter Pad 1 1/2" x 21" x 21" Compare $19.50 Easy to install roof drain filter keeps debris away from drain to allow water to drain. Avoid clogged drains and expensive water damage by keeping leaves and large debris away from roof drains. Our economical, easy-to-install Roof Drain Filter holds... Add to Cart Add to Cart Add to Wish List Add to My Wish List Create New Wish List