17 Flexible potable water supply line pipes, not of metal, for use in plumbing systems of residential dwellings and commercial buildings and sold through home improvement retailer stores; Non-metal elbows for flexible potable water supply line pipes for use in plumbing systems of residential dwellings and commercial buildings and sold through home improvement retailer stores; Non-metal fittings for flexible potable water supply line pipes for use in plumbing systems of residential dwellings and commercial buildings and sold through home improvement retailer stores; Non-metal flexible potable water supply line pipe couplings and joints for use in plumbing systems of residential dwellings and commercial buildings and sold through home improvement retailer stores