The DuraVent 4DVC appliance connector is a pipe fitting from DuraConnect, a collection of connector systems to be used in type B gas vents. This appliance connector is designed to be used to attach an appliance to a DuraConnect connector pipe. It has an inner diameter of 4 inches and a length of 5 inches. It also includes a built-in twist lock fittings to make it easier to be installed. It is resistant to condensate corrosion and is a UL-listed product.DuraVent has been true to their commitment to become the technological leader in the venting industry. Add these high-quality and innovative products in your vent system as you find it here at PlumbersStock.com.