Wet venting is used most often in conjunction with sinks and toilets. The drain from the sink serves as the vent for the toilet. It can be used for many purposes, but it is most common and convenient.

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The sink drain is where the toilet vents. The length of the toilet drain should be three inches and the drain 1.5 inches. The area for the shared sink drain/toilet vent should measure 2 inches. Vents that go up should be 1.5 inches. As shown, the fitting connecting the drain at the top to the drain at the bottom should have a “y” rather than a “tee”. 

Both the toilet and the sink are vented wet. The wet vent is connected to the vertical part of the drain for the toilet which is also beneficial. Additionally, this time we have a tub attached with the vent that is wet. In the event that your tub is located less than 5 feet from the wet vent, it wouldn’t require that additional vent for the tub. This is an excellent method you can save on building materials and time.

Studor is a brand-name air admittance valve that solves venting problems where open air venting pipes won’t work. Studor vents let air flow through the pipes, while keeping odorous sewer gases from escaping. A toilet flushes more water down the drain, creating a negative pressure.

To make your drain work properly, you will need to install a drain vent. There may be problems with the vent. For example, the fixture that isn’t equipped with a vent could drain slowly. The drain is likely to make gurgling sounds. 

Both the toilet and the sink are vented wet. Poorly ventilated drain lines that are not vented properly could be a problem as it pertains to the transport of solid waste and water from your home. It can cause drains to overflow or toilets to be backed up.