yoke relief vent, yoke ventSee yoke vent, 2.
1. A pipe connecting upward from a soil stack or waste stack to a vent stack for the purpose of preventing pressure changes in the stack.
2. A vertical or 45° relief vent of the continuous-waste-and-vent type formed by the extension of an upright wye branch or 45° wye branch inlet of the horizontal branch to the stack; becomes a dual yoke vent when two horizontal branches are thus vented by the same relief vent.
3. A vent connected to a soil or waste stack that continues upward to the connection with the vent stack for the purpose of reducing pressure changes in the stack.