What type of vent is commonly used for individual fixtures in plumbing?

The option that addresses the specific type of vent commonly used for individual fixtures in plumbing is the back vent pipe. Back vents serve the purpose of providing air to a fixture trap while also preventing siphoning and maintaining a proper flow in the drainage system. They are particularly effective for individual fixtures because they connect to the drainage system and allow air to enter, which helps to equalize pressure, ensuring that the traps remain filled with water and preventing sewer gases from entering living spaces.

Using a back vent pipe helps to improve the efficiency of the plumbing system by reducing the risk of trap siphonage that can occur with negative pressure in the drainage system. They are typically installed at or near each individual fixture and can connect to the main vent stack, ensuring that adequate venting is provided for each plumbing fixture individually. This makes back vent pipes an essential component in maintaining the functionality and hygiene of a plumbing system.