The HDPE Hose Chute is extrusion welded 6″  HDPE plastic pipe. The front plate is 1/2″ while the back plate is 1/4″. The front plate has a 9″ x 9″ face plate to seal the hole through the wall. This hose chute works with walls as thick as 14″. Replacement plates are available upon request. Made locally here in Michigan.