Final answer:
The correct answer is option 3) Cross fitting.The correct answer to the question about the fitting required for making the intersection between a yoke vent and a drainage stack is a cross fitting, as it accommodates the connection of four pipes.
Step-by-step explanation:
In plumbing, when creating an intersection between a yoke vent and a drainage stack, a cross fitting is typically used. This type of fitting allows for the connection of four pipes: one that connects to the main stack, one that goes to the yoke vent, and two additional lateral connections which may lead to other fixtures or additional vents. A tee fitting would not provide the necessary four connections as it only accommodates three, an elbow fitting only changes the direction of a single pipe, and a reducer fitting is used to transition between different pipe sizes, which is not the goal in this scenario. The cross fitting, therefore, best meets the requirements of intersecting a yoke vent with a drainage stack while following proper plumbing codes and facilitating efficient drainage and venting.
When making the yoke vent intersection with the drainage stack, an elbow fitting is typically used. An elbow fitting is a curved pipe fitting that allows for a change in direction. In this case, it would be used to connect the yoke vent to the drainage stack at a 90-degree angle.
An elbow fitting is often made of materials such as PVC or copper, and it comes in different sizes to fit the specific requirements of the plumbing system.