Once you’ve confirmed your plumbing or drainage product is WaterMark certified, it must be installed by a licensed plumber. This ensures the installation complies with the National Construction Code, meaning your new plumbing or drainage system will be safe for use by you, your family and friends.
Always ask your plumber if they are licensed before they start any work. You can also check with your local plumbing authority. Please note that plumbing work undertaken by unlicensed people can attract penalties.