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1

This is a sanitary tee and can only be used as shown in the vertical orientation. They are only used to go from the horizontal to vertical plane. If used flat (horizontal) they are prone to clogging. You must use a long sweep or wye+⅛ for horizontal DWV.


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The combo tee has a longer sweep. Long sweeps are easier to run a snake through and drain better as the water path is gradually changed (if you have the space to use them). 45 wye Combination wye & 1/8


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Or, don't vent externally at all. In many jurisdictions you have the option of an AAV - Air Admittance Valve, readily installed in a wall box behind the washer. An AAV involves a gravity seal that opens just when needed to let fresh air into the plumbing pipe. Just makes sure what you get is a real AAV, not just a cheap $3 check valve. They're ...


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I used a quick and very cheap solution, taking a standard plastic elbow and jamming it on to form a vent cap: This will not affect vent operation, but will keep a large fraction of the rainwater out of the pipe, potentially extending the pipe lifetime by a few decades. This also has a presumably minor benefit of keeping rainwater out of the sewer.


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@beast solution is the first that came to mind. Another way to improve this, would be to connect vent pipe from close to each WC UPWARDS to the vend stack above the height was the wc.


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(note: this answer is based on UK practices, the general principles are likely to apply everywhere but details of how the problems are mitigated may vary between jurisdictions). Various nasty gasses can come off the contents of waste pipes and we don't want those gasses to be allowed into the house. To block the sewer gasses from entering the house we have ...


3

Your system is almost certainly vented. Plumbing vents provide a path for sewer gases to escape so they don't bubble up through the P traps into your house under pressure (the sewer gases will expand and exert greater than atmospheric pressure), and the vents also keep water pressure from siphoning your traps dry, which would create an easy natural path for ...


4

Depending on the size and age of your home, and the location of the plumbing fixtures. It's entirely possible that there's only a single vent stack. If all the drains are within a certain distance of the stack, no additional vent pipes may be required. According to Wikipedia's article on Drain-waste-vent system. ...Under many older building codes, a ...


3

The one pipe you notice exiting from the roof is indeed a vent stack. Since there is only that single pipe projecting out it would be reasonable to guess it is the main stack that all the other drain lines connect into. The simple reason for not seeing any smaller or secondary vents is because they are located out of sight behind the walls at each sink or ...


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Of course your system is vented. If it was not vented it would not drain properly (if at all). The vent riser pipe is connected to your waste pipe system inside your walls, where you cannot see. If you wish you could open the wall below where the vent riser is and educate yourself on the configuration. This would lead to significant wall repair so I would ...


2

The smaller diameter pipe is because it is specified for in-wall use. The socket end of a standard 3" PVC pipe coupling is 3.97" which is wider than a 2 x 4 stud wall cavity, which is 3.5". The 3.25" pipe OD on the in-wall pipe allows for a smaller coupling which can fit inside the wall cavity. Depending on the size and type of leak, you might have been ...


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A partial blockage allows some draining, but will backup when the water flows fast. It's not unusual. You can clean the line with a snake - let the water run the whole time (to wash the dirt away, and keep down the smell), and go back and forth with the snake letting it spin and clean the walls of the pipe. I also don't see a vent, but it may be hidden.


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From the photo you posted I can see you have a different problem from what you may think. The reason the vent pipe is damaged is because a "critter" has ben gnawing it away! The most likely suspects in the animal world (in N.A.) would be in the rodent species: squirrel, rat, chipmunks, porcupines to name just a few. You can see the small serration grooves ...



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