This mushroom shaped aluminum Code Cap Top is designed to work with Gibraltar Code Cap Bases， The top is secured to the base with 3 bendable tabs， This Code Cap Top is easy to install and can be replaced without requiring a new base， The unique design allows for sufficient airflow while protecting the inside of the structure from wind driven rain.
Top for 4 in. code cap base
Exhaust pipes 4 in. Dia
Easy to install and adjust
For use on flat roofs to 5/12 pitch
Suitable for commercial or residential use
Kitchen， bath and type b exhaust pipes
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