Charlotte Pipe Schedule 40 DWV Reducing PVC Coupling, 4 In. Hub x 3 In. Hub is a versatile fitting specifically designed for use in Drain, Waste, and Vent (DWV) systems. Crafted from durable PVC material, this coupling is i for connecting pipes of different sizes within DWV applications. Its hub-to-hub configuration allows for easy solvent welding, ensuring a secure and reliable connection. This coupling provides a practical solution when you need to join pipes with varying diameters, helping maintain proper flow and drainage throughout your plumbing system. Model Number: PVC 00102 1400HA