What is the primary purpose of plumbing venting?

The primary purpose of plumbing venting is to prevent the siphoning of traps and allow sewer gases to escape. Venting systems are crucial in plumbing as they maintain neutral air pressure within the drainage system. This is important because if the pressure in the system drops too much, it can create a siphon effect that might pull water out of the traps. These traps are designed to hold a small amount of water to block sewer gases from flowing back into living spaces. Properly designed venting allows for this water seal to remain intact while also providing an exit for harmful gases, ensuring both safety and functionality in plumbing systems.