Washing Machine Drain Without Vent

If they omit the trap and vent it s a mistake that can.

Washing machine drain without vent.

If the washing machine drain continues to have backflow problems ensure the drain vent is connected and properly working. If the drain of your washing machine fits tightly into the drain you definitely need a washing machine drain vent. When hooking up a new washing machine some people look for a convenient drain line and simply install a pipe that extends to the washer. If your drain is not at least 30 from the base of the washer you can use an anti siphon clip to attach the hose to the back of the washer.

All household drains are vented to a drain vent typically located on the. This is the purpose of a venting system. As water goes down a drain air is needed to equalize the pressure in the drain line. The piping in the photo on the left represents a laundry sink drain while the photo on the right depicts a washing machine s stand pipe.

In your scenario if a fixture that s farther upstream discharges lots of water that rushes by the wye fitting where your washing machine drain pipe connects the vacuum created by the water rushing past the washing machine branch wye will siphon water from your trap. Although not always mandated by building codes it s a good idea to put one in when you install a washing machine. When builders look only at the table without reading the text they find that a 2 inch diameter drain can run a maximum distance of 8 feet to the vent. A washing machine drain vent serves a very important purpose.

If the drain lines in your home have poor venting as in figure a for example water rushing down the drains will pull water from nearby p traps. They may also see that the slope column references 1 4 inch per foot but they are likely to assume that it s just reiterating the minimum allowable slope for a 2 inch drain. The same holds true for plumbing vent pipe. In each a is the vent b is the trap arm and c is the drain.

It allows air in which prevents the.