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This McAlpine non-return valve tee is designed to prevent a backflow of water. It is strictly for use when there is no other alternative and on the basis that they are cleaned very regularly.Features & Benefits: McAlpine NRV Tee - 1 1/2 inch, Prevents a backflow of water, For use when there is no other alternative, Must be cleaned very regularly, Low-cost. McAlpine NRV Tee - 1 1/2 inch White Polypropylene T28MNRV