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. Other sizes and length are also available upon request (please call 989-317-8370). Made locally here in Michigan.