Black Swan's DWV Plastic J-Hooks are suitable for hanging plumbing supply lines, hydronic heat piping, ABS, copper, cast iron drains, DWV lines, and furnace vent lines firmly in place. Solid one piece ABS plastic construction. Snap fit holds pipe firmly, quick and easy to install. Nail holes serves as drop markers. Nails can be driven through all sides of the hanger to allow versatile installation. ABS and PVC pipe can be solvent welded to the hangers.