SELKIRK CORP 103180 3-Inch  Gas Vent Tee Cap Manufactured in United states Easy to use Highly durable 3" inch, 3RV-TC, Round, Type B, Gas Vent Tee Cap Tee cap is used for closing off the bottom of the tee; This item is made out of aluminum. RV series offers round gas vent pipe and fittings for residential, commercial and industrial applications Features a snap together, non-positional lock system, die formed ends and eliminates the need for all cutting, fitting and special engineering Has an improved joint design provides for secure connection in seconds