RVIA Registered RV Technician Practice Test

Question: 1 / 400

A check vent, also known as a ________________________, is a secondary vent device that is sometimes used downstream of a trap to provide venting.

Anti-Siphon Trap Vent Device (ASTVD)

A check vent, often referred to as an Anti-Siphon Trap Vent Device (ASTVD), serves a crucial role in plumbing systems, particularly in preventing the siphoning action that can occur with traps. Siphoning can lead to a loss of water in the trap, which is essential for preventing sewer gases from entering living spaces. The ASTVD allows air to enter the drainage system downstream of the trap, thereby equalizing the pressure and facilitating proper drainage without allowing odor to escape.

This device is particularly beneficial in situations where the main venting system may not be effective, such as in certain configurations of plumbing that may inhibit typical venting practices. By allowing additional air into the system, the ASTVD helps to maintain the water seal in traps, ensuring that they function correctly and contribute to a sanitary environment.

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Pressure Relief Vent

Drainage Overflow Vent

Retaining Vent Device

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