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My washing machine drain is 7.5 feet from the floor. I plan on researching my washer and making sure it can pump that high. I want to hook it up to a 1.5 inch PVC pipe drain. The 1.5 pipe is above my main sewer drain.

This leaves me with less than a half foot to connect it to the 1.5 drain pipe. How should I do that?

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How far above the floor is your main drain? –  mikes Dec 19 '12 at 1:16
I feel like some sort of critical information for understanding this question is missing, like why you have less than 6 inches to connect. –  Jeff Ferland Dec 19 '12 at 1:17
Also, 1.5 inches is considered too small for a washing machine drain. 2" is standard. –  Paul Dec 19 '12 at 1:26
A picture might help us understand the problem. If you don't have the rep to include the image, just post a link to your image and someone will edit it in for you –  Steve Dec 19 '12 at 3:05
Most modern washing machines come with a drain line, that happens to be the exact length of the maximum pumping distance of the machine. If your machine has a drain line that was attached to the machine from the factory (or came in the same packaging as the machine), that represents the exact distance the machine can pump waste water (minus ~6" for the hook loop). –  Tester101 Dec 19 '12 at 14:54

1 Answer 1

I would recommend not doing what you suggest, here's why:

A typical rough-in for a clothes washing machine is as show in the picture below and consists of the following:

  • vent
  • 2" p-trap
  • vertical section of 2" pipe above the p-trap
  • (an actual outlet box as shown is not required, you can just use the plan end of the pipe)

Your discharge hose will fit inside the 2" pipe opening and will usually enter the pipe about 6" to 8". This connection is not water/air tight.

The size of the p-trap and the vertical section of pipe are to accommodate for the flow rate of the washing machine's discharge. The p-trap will create a restriction to the flow and the vertical pipe allows for some head water to buildup without putting any back pressure on the washing machine's internal pump.

laundry machine rough-in

A p-trap is a must as it will prevent sewer gas from entering your house. The vent is required to protect the water seal of the p-trap but can be replaced with an air admittance valve depending on local codes.

I would imagine that if your machine can pump that high it will be near its limit and without any room for a vertical section of pipe to discharge into you will have to make the connection sold which will put additional back pressure on to the machine's pump (even more due to the pipe size only being 1.5") which will shorten the life span of the pump.

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