3 inch x 2 inch Drain Waste Vent (DWV) PVC Plastic Coupling (Hub/Socket x Hub/Socket). These fittings are designed to meet most residential, industrial irrigation/agricultural needs. They offer rigidity with resistance to chemicals and corrosion. A smooth interior wall provides free flow and helps prevent scaling. Highly versatile, lightweight and easy to install. Smooth inner walls allow for low pressure drops and resistance to chemicals and corrosion. Case of 20.