Cummins DEF Header | 5511563

Restore reliable emissions performance with this aftermarket DEF header, designed to replace OEM Cummins 5511563. Built to OEM standards and ideal for heavy-duty trucks and diesel equipment, this header delivers accurate DEF fluid level and temperature readings—critical for maintaining SCR efficiency and emissions compliance.

Constructed from corrosion-resistant materials, it stands up to DEF crystallization, extreme temperatures, and constant vibration in tough working environments. This header is designed for long-term durability and plug-and-play installation, requiring no special tools or modifications—perfect for reducing downtime in fleet maintenance and repair operations.

Unlike OEM parts, this unit is no-core-required, saving time and money while avoiding the hassle of core returns. Whether you're replacing a failed sensor or upgrading your DEF system during scheduled maintenance, this part offers a dependable, cost-effective solution.

Backed by a full manufacturer warranty, this DEF header gives you peace of mind and performance you can count on. Trusted by fleet managers, diesel technicians, and owner-operators across the country.

Order now from American Radiator for fast shipping, reliable service, and a high-quality DEF header that keeps your diesel system running strong.