My washing machine drain overflows on occasion. I recently installed an in-wall box for the valves and drain. The drain is 2" dia and 31" in length, 42" above the floor. There is a trap also 2" and a run of 5" to the main line also 2" in dia. The vent is 1.5" and is clear. It does not always back up and overflow although recently most often. I can run the garden hose in the drain on full without any issues and in the main line and vent the same. But when the machine drain cycle runs with a large load it may overflow. Is there some problem with the water and soap in the line bubbling up? If is stop the cycle prior to overflow the water clears right up, drains out. This has been a problem in the past and recently started back up. I have read some of the answers and the closed approach sounds fine, how do I hook the hose to the drain line? I want to install carpet in the adjoining room and cannot afford further issues.

All fed up.

Tony

"I have read some of the answers and the closed approach sounds fine, how do I hook the hose to the drain line?"
Too late if you cut the stand pipe off flush with the washer box. You need at least a inch of pipe to attach a compression fitting. Today's washer pumps are much more powerful then the older models. The complaints about this problem are pouring in. About all I can suggest is pack wet rags around the hose when you wash. Regards, Tom

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Originally Posted by speedball1

"I have read some of the answers and the closed approach sounds fine, how do I hook the hose to the drain line?"
Too late if you cut the stand pipe off flush with the washer box. You need at least a inch of pipe to attach a compression fitting. Todays washer pumps are much more powerful then the older models. The complaints about this problem are pouring in. About all I can suggest is pack wet rags around the hose when you wash. Regards, Tom

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Ok, I want to do this right. I can change it around for a compression fitting. Just use one that accommodates the hose? Or is there a certain type to use? Tony

This is the compression I was referring to,(see image)' you will need a little over a inch to glue it on the stand pipe. I have has one installed on my 1 1/2" standpipe for years with no backups or problems. Good luck, Tom