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How to Repair a Delta Diverter Valve

Mary Lougee

Delta manufactures a large array of fixtures for the bathroom and kitchen. There are several styles and finishes of bathroom fixtures for a shower and tub combination. A diverter valve directs the main flow of water to either the showerhead or the tub spout. Turning the diverter knob opens one valve in an internal cartridge for water flow and closes the other valve to shut off the water flow to it. After several years of use, diverter valve seals wear out or break and cause the water to leak from under the handle. A defective diverter valve will also allow water flow from only one area.

Repair a Delta Diverter Valve
  1. Turn the water supply off to the shower.

  2. Insert an Allen wrench into the setscrew in the diverter handle bottom on a paddle type knob. Turn the Allen wrench counterclockwise to loosen it. For a round knob-style diverter, pry the knob cap off with a screwdriver and loosen the screw underneath in a counterclockwise direction. Pull the paddle knob or round knob off the diverter.

  3. Place a pair of adjustable pliers on the brass bonnet. Turn the pliers counterclockwise to loosen the bonnet. Pull the bonnet straight out and off the valve. Unscrew and remove the plastic sleeve in a counterclockwise direction.

  4. Pull the cartridge out of the cartridge body with adjustable pliers while twisting it side to side.

  5. Align the bottom pin of a new cartridge with the hole in the cartridge body to insert the cartridge.

  6. Place the plastic sleeve on the cartridge and tighten it clockwise with adjustable pliers. Repeat this process to replace the brass bonnet.

  7. Place the knob on the diverter and tighten the screw in the center on a round knob or the setscrew on the bottom of a paddle-type knob.

  8. Turn the water supply to the shower on.