4 inch Stainless Steel Rain Cap

The 4 inch stainless steel exhaust rain cap provides premium outdoor weather protection for 4 inch (102mm) bore vertical exhaust stacks — one of the most common bore sizes across heavy industrial generators, crushing plant and construction equipment. The stainless steel construction ensures long-term performance in outdoor conditions, resisting the corrosion that affects mild steel caps when continuously exposed to rain, moisture and atmospheric agents. The gravity-operated hinged design provides fully automatic operation — closing under gravity when the engine stops and opening freely under exhaust gas pressure when it runs. This is one of the most in-demand sizes in the stainless rain cap range.