How to Use a Flexible Sink Drain Hose

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Flexible sink drain hoses are available for most under-sink plumbing needs. The type of flexible drain hose you need to use will depend on the plumbing or appliance that you need to connect to the main drain line of the sink. Installing flexible drain hose that connects from a garbage disposal to the sink's main drain line uses a slip-nut connection. This type of connection requires a minimal set of tools, and installation normally takes less than one hour.

Things You'll Need

  • Water pipe wrench
  • Main Tee fitting with slip-nut connections
  • Tape measure
  • Permanent marker
  • PVC cutter
  • Slip-nut down tube
  • Phillips screwdriver
  • Rubber washer
  • Flexible drain hose
  • Loosen the nut that connects the down tube to the strainer with the water pipe wrench if you are unable to turn the nut by hand.

  • Turn the slip-nut that connects the down tube to the P-trap counterclockwise with your hand to loosen the connection.

  • Pull the down tube toward you then up to remove the down tube.

  • Slide the slip-nut onto the raw end of the main Tee and place the compression ring with the tapered end facing the slip-nut onto the main Tee.

  • Slip the raw end of the main Tee that you prepped in the previous step into the top of the P-trap. Tighten the slip-nut you installed on the main Tee to the P-trap. Make sure that the inlet for the flexible drainpipe aims at the garbage disposal.

  • Measure the distance from the sink strainer connection to the top of the main Tee you installed in Step 5 and add 1 inch to the length.

  • Mark the length you measured in Step 6 on the down tube with the permanent marker, measuring from the threaded end of the down tube.

  • Cut the down tube to size with the PVC cutter.

  • Place the slip-nut facing the threaded section of the down tube and another slip-nut and compression ring onto the raw end of the down tube as described for the main Tee in Step 4.

  • Slide the raw end of the down tube into the top of the main Tee.

  • Hand-tighten the upper slip-nut to the threads located on the sink strainer.

  • Tighten the lower slip-nut to the threads located on the top of the main Tee.

  • Remove the two screws that hold the cover mounting plate to the garbage disposal with the Phillips screwdriver.

  • Slide the raw end of the flexible drain hose through the opening of the cover plate.

  • Place a slip-nut and compression ring onto the raw end of the flexible drainpipe as described in Step 4.

  • Slip the raw end of the flexible drain line into the threaded section of the main Tee and the rubber washer onto the flanged end of the drain line.

  • Secure the cover mounting plate back to the garbage disposal, reusing the two Phillips screws that you removed in Step 13.

  • Tighten the slip-nut to the main Tee to complete the installation of the flexible drain hose.

  • Turn on the water to test your installation for leaks.

  • Tighten any slip-nut connections that leak water to seal the connection.

References

  • Home Depot -- Home Improvement 1-2-3 New Addition, Pages 101 and 102
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