Caterpillar 3291388 Air Conditioner Hose Fitting

The Caterpillar 3291388 is a threaded air conditioner hose fitting designed for the high-side charge port on Caterpillar machinery equipped with C11 and C13 diesel engines. This fitting features a 3/4-16-2A thread specification and accommodates hose with a 12.7 mm (1/2 in) inner diameter. It functions as a critical connection component within the HVAC refrigerant circuit, ensuring leak-free sealing under high-pressure operating conditions. The fitting is engineered to Caterpillar specifications for compatibility with the A/C system on 966H and 972H wheel loaders. Construction utilizes high-strength steel with corrosion-resistant plating to withstand harsh under-hood environments and vibration.