SELKIRK CORP 103080 Universal Fem Adapter, 3-Inch Manufactured in china Easy to use Highly durable 3" inch, 3RV-UAF, Universal Female Adapter Designed for round type B gas vent Allows Metalbestos B-vent connectors to be used in conjunction with other brands of existing vent Used to adapt to Metalbestos pipe toward appliance Adjustable flange fits any wall