This rubber hose connects the pneumatic compressor to the air system on the host tractor. It carries compressed air from the compressor outlet to the downstream distribution block or reservoir. A cracked or collapsed hose causes air loss, reducing brake or implement control pressure. The original hose is molded to the correct bend radius and fitting geometry for the compressor mounting location, which prevents kinking and maintains flow. When replacing, verify the hose routing avoids contact with hot engine surfaces or moving belts.