We have a 40 year old house and the washing machine drain is essentially just a PVC pipe that goes to the central drain that connects to the kitchen sink. You can not even run the dish washer at the same time or there will be back up.
At any rate, there is not a pipe that goes through the roof for air intake (I do not know what this is called) so the washing machine drain can tend to over flow. It has done this more often lately for some reason.
Is there a maneuver option I can put in place to make sure the drainage is consistent and enough air gets in to let it flow properly, other than making the PVC huge? It is about three inches in diameter with a height of about three feet now. If I make it taller it will obscure a window and look absurd.
Is there a plumbing piece that will act like an air valve at the bottom or something to help the flow?
Am I even making sense? lol
Here is a pic of what I mean: