How to Install a Drainage Pipe for a Washing Machine

The simplest and cheapest way to hook up your washing machine's drainage pipe to your gray-water system is to install a trap with an additional washing machine/dishwasher waste inlet beneath your sink. This will send the waste from your washer the same way as the dirty water from your basin. If you already have one these traps installed under your sink, your job will already be half done.

Sink trap with waste inlet
Wrench
Old towels
Silicone gun
Drain hose extension
Hose clamps

Instructions

- 1
  Remove the trap from beneath your sink if it doesn't have an additional waste inlet. You should be able to unscrew the connectors that secure your trap to the base of your sink and your waste pipe with your hands. Use a wrench if the connectors are stubborn. You may want to lay some old towels over the area below your sink to catch any residual water before you start.
- 2
  Screw your new trap into place beneath your sink.
- 3
  Run a bead of silicone sealant around the joints between your trap and the base of your sink and your waste pipe.
- 4
  Connect a drain pipe extension to your machine's waste outlet if it doesn't reach your sink trap. Use a hose clamp to secure it into place. Some washing machine manufacturers sell machine's with very short drain hoses to save on production costs.
- 5
  Connect the other end of your drain hose to the waste inlet on your sink trap by pushing it firmly into place. Secure the connection with a hose clamp.

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