 What do you look for in a toilet and in-wall system? A soft-close seat. What you must be looking for is the watermark. You'll find it on the product. Most plumbing and drainage products installed in Australia must be watermark certified and come with a watermark logo and license number included on the product when sold. This means that the toilet works properly and the waste is flushed away safely. So to make sure that it's safe and fit for purpose, always look for the watermark.