3-Pack: Dishwasher-Disposer Drain Connection Kit, or Flexible Reducing/Reducer Coupler/Coupling. 1" x 5/8" or cut to: 1" x 3/4" or 3/4" x 5/8" 3-Pack Use as a Food-Disposer-to-Dishwasher Kit. Use as a versatile drain coupler to join 1" to 5/8", 1" to 3/4" or 3/4" to 5/8" drain pipes.