PolyJohn Polysink In-Unit SinkThe all new PolySink has been designed to be our most versatile sink front yet. With many different applications, and the ability to use it in a wide range of portable toilet models this sink will be the solution you are looking for. The biggest improvement from past models is the completely separate rotomolded sink basin. Now that the sink basin is separate from the fresh water tank the threat of cracking and cross contamination of fresh and gray