Elevate your truck's cooling system with our high-quality International LoneStar Coolant Reservoirs. Designed to replace outdated reservoirs like the 2591620C91, these components keep your International LoneStar truck running efficiently. Featuring a 3-inch twist-on vented cap with a 15 PSI rating, these reservoirs ensure reliable coolant containment and easy maintenance access. Whether replacing an old part or upgrading, our coolant reservoirs offer the durability and performance your truck needs. Enhance your truck's cooling system with the best products in this essential product lineup.