Make sure the safety, air and electrical parts on your International semi truck are up to your standards by shopping 4 State Trucks' high quality selection. We carry a variety of aftermarket parts including airlines and airline boxes, roadside gear, safety flags, and more designed specifically for the 4100, 4300, and 4400 Durastar models. Make sure your big rig is ready to hit the road with quality parts from 4 State Trucks.