Buyers Products (CC400) 4" PVC Conduit Carrier Kit Designed for use with ladder racks, this kit offers flexibility to build a kit to any desired length Includes cast aluminum door, end cap and saddle brackets; and zinc-plated U-bolts and hardware providing superior protection and durability Door features spring loaded latching mechanism, padlock tab (padlock sold separately) and rubber gasket for security and weather resistance Simple assembly and lightweight kit provides quick and easy installation For use with 4 inch diameter PVC pipe (not included)