4"OD-3" ID Aluminized Reducer and Clamp Set Heavy Duty Exhaust Parts

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NOTE: Questions, Call 715-254-2307

4" OD-3.0 ID Aluminized Reducer and Clamp Set 

Reducer: 4 inch outer diameter on one end, to 3.0 inch slotted, expanded inner diameter heavy duty aluminized steel pipe

8 inch total length

3.0 inch ID expands to 4 inch OD. Connects our stack installation bed kit to your 3.0 inch Exhaust

Clamp: 3.0 inch Accuseal Aluminized Exhaust Clamp

Evenly distributes clamping pressure

These reducers are primarily used to connect our stack kits to your existing exhaust size.


  • R4O-30IA Reducer
  • AS-30A Accuseal Clamp
Warranty Information: Chrome-plated (except weld area) and aluminized parts used on heavy duty truck exhaust systems are warranted against defective material and workmanship for a period of 1 year from date of shipment. Call if you have questions on proper installation techniques. Grand Rock and Black Cloud Diesel cannot be held liable for damage done as a result of improper installation. If a part is determined to be defective, Grand Rock and Black Cloud Diesel reserve the right to replate only and return the part when the part has been modified, altered, or otherwise damaged. Neglect is not Warranted! Keep the parts clean & waxed!