Clothes washer drain won't handle new washer flow

Studor vent. Brand name for an AAV (automatic air vent.)

AStudore Vent is a AAV. ( Automatic Air Vent). However, this has nothing to do with your problem.
Your problems is to say as my. Your water pump puts out too much volume for your own. The drainage system to handle. The solution is to make your drainage a closed system. This will force the drainage into your system without any backups. You may connect the washer hose through the standpipe using duct tape or a compression fitting. (See image). Good luck, Tom

Sorry, Tom, but I'm going to disagree with you on this one!

Here, in Boston we have 1.5" drains for decades now and even with the newer washers we aren't having any issues with volume from the new washers...not unless the drain line is partially clogged.

Here, if say the new washing machine is having issues as so many present here online we just go in and snake the drain. If that doesn't work then we cut into the drain pipe where it joins the main drain and clear the opening wide open (cast iron and galvi. is common). When we do this, the 1.5" pipes handle everything just fine. Further, 1.5" PVC never has a problem... EVER!

Finally, I understand what you propose, and it will work as it has for you for decades now, right? I just wanted to point out that the drain line can be cleared of debris or rigged up as you suggested.

Thanks!

Mark

Hi Mark,
Your disagreement is not with me but with the hundreds of people that have followed this advice with no complaints. I still say that today's more powerful washer pumps overpower a inch and a half drainage set up. I had to make a close connection on my standpipe, even after I snaked it. Regards, Tom

I still say that today's more powerful washer pumps overpower a inch and a half drainage set up

I'm telling you they don't overpower the 1.5" drains or all of Massachusetts would be in serious trouble.

Here, from all the times my snake didn't clear the blockage in the smaller pipes I just cut the pipe at the main drain line and always found it choked down to the size of my drain cable...drain cable just can't clear the line enough. I then take a long chisel/screwdriver and clean the connection real well, connect all and never a problem again.

I know it is hard to believe, but MA code still allows 1.5" drains and I swear they work just fine with the HE washers... ;)

Thanks, Tom!

So, what do we tell the people that have tried everything, including snaking the drain line, that still have a problem? Such as me. Closed systems work! There can be no argument there. Just ask the hundreds of people over the years that have installed a closed system with no complaints. Not a single complaint in all those years. Sure, to ahead and snake. But if that don't work you can always install a closed system on your standpipe and be assured of, though backups. Regards, Tom