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This MacValve 90 degree bend comes in different sizing options and is for use with the MacValve self-closing waste valve. The S4U 90 degree bend is sized with a 1 1/4 inch female inlet nut and a 1 1/4 inch BSP male connector, while the T4U 90 degree bend has a 1 1/2 inch female inlet nut and a 1 1/2 inch BSP male connector.Features & Benefits: McAlpine MacValve 90 Degree Bend (Female Inlet Nut) - 1 1/4 inch, Affordable, For use with MacValve self-closing waste valve, Sizing options, 90 degree bend. McAlpine MacValve 90 Degree Bend (Female Inlet Nut) - 1 1/4 inch White Plastic Polypropylene S4U