The Dock Seals superior 36 oz. nylon reinforced vinyl facings have a higher tear strength than equivalent weight hypalon. The chemically sealed ends prevent moisture infiltration. It is mounted on and bonded to a durable wolmanized wood and contains a full height air escape tunnel. The unit consists of a three (3) piece construction (12" high; sides - beveled sides with 9-1/2" width at the wall and 12" width at the face) and a through the wall installation kit that is included. 5" maximum compression is recommended. Application with a flush dock to building in conjunction with an Edge-O-Dock use a twenty (20) inch projection Dock Seal. To ensure proper size complete and fax the survey sheet below. Units are non-returnable.