The WaStop Inline Non Return Valve has an ingenious design. Therefore, this design ensures you are provided with the best possible protection against backflow, flooding and odour control. Sizes are available to fit most sizes of pipes up to 1800mm. However, where more bespoke fittings are required contact AQUIKO and we will be able to assist. Due to the unique way in which it works with differential pressure it works autonomously. Therefore, there is no need for human interaction or electricity. In conclusion, without the need for constant maintenance, the WaStop just works!