Shop for Aftermarket CAC Clamps, Boots & Hoses for the Mack CV/GU Model. Keep your Mack CV/GU truck s charge air cooler (CAC) system in top shape with durable clamps, hoses, and fittings. From silicone and EPDM hoses to heavy-duty T-bolt clamps and 90-degree elbows, we ve got what you need for efficient airflow and leak prevention. Whether it s replacements or upgrades, our tough BESTfit parts are built to handle the demands of the road, ensuring your Mack stays reliable and running strong.