Frost King Poly Foam Caulk Saver C22H

Reduces the amount of caulk needed to fill large gaps. Works with virtually every type of caulk & sealant. Made of durable, resilient, moisture repellant poly foam. Just press in place, then caulk on top of it. Moisture repellent Saves expensive caulk while filling large gaps Also referred to as backer rod Additional discounts apply for this item when purchased as Bulk.