Washing Machine Drain Vent - 2-inch pipe for washing machine drain; Standpipe 24 inches above p-trap; Branch arm to vertical stack. The Standpipe. The correct way to drain a washing machine is to install a standpipe. That is a vertical length of pipe that connects to a P-trap that, in turn, connects to the drain. The top of the standpipe must extend above the overflow level of the washing machine, and it must be properly vented. 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 each A is the vent, B is . If the drain of your washing machine fits tightly into the drain, you definitely need a washing machine drain vent. It allows air in which prevents the possibility of a . 28 de ago de 2013 - Briefly on your questions: No AAV for washers, washer must drain into an open standpipe that is trapped and vented. Your diagram indicates . 23 de mar de 2016 - Yes, the picture you included shows a good plumbing layout for a washer and laundry sink. In particular, it provides good ventilation for both the . The plumbing system shall be provided with a system of vent piping that will permit the admission or emission of air so that the seal of any fixture trap shall not be . Plumbing vents: Definition of plumbing vent terms, types of plumbing vents, . washing machine to a vertical standpipe connecting the washer to a drain line.