SELKIRK CORP 104180 4-Inch  Gas Vent Tee Cap Manufactured in United states Easy to use Highly durable 4" inch, 4RV-TC, Round, Type B Gas Vent Tee Cap Tee cap is used for closing off the bottom of the tee 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