A heavy-duty product molded from strong, yet lightweight, high-density polyethylene plastic. Completely corrosion proof and acid, alkali, and frost-resistant. Will not crumble, break, or rust. 3 preformed inlet collars accept corrugated lines from inside the basement perimeter or floor drains. These lines snap on the collars quickly and easily. A molded in panel on the side of the sump (which normally faces toward the basement footer) is designed for accepting the outside basement perimeter drainage line at the height desired. Lid, (not included) fits inside top diameter of sump. Liner size: 19 In. x 24 In.