Washing Machine Drain Without Vent

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.

Washing machine drain without vent.

If the washing machine drain continues to have backflow problems ensure the drain vent is connected and properly working. This is the purpose of a venting system. The same holds true for plumbing vent pipe. You only have to remember this the sanitary tee that serves each fixture is the place where the trap arm drain and vent come together.

All household drains are vented to a drain vent typically located on the. 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. 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.

If they omit the trap and vent it s a mistake that can. 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. In each a is the vent b is the trap arm and c is the drain. 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.

If the drain of your washing machine fits tightly into the drain you definitely need a washing machine drain vent. 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. It allows air in which prevents the. As water goes down a drain air is needed to equalize the pressure in the drain line.

Kevin the answer is no.