Def Cap

Gates Non-Locking DEF Caps prevents diesel exhaust fluid from leaking or spilling through the filler neck, while keeping dirt and debris out. The distinctive blue cap color is designed to help automotive technicians clearly identify the DEF tank filler neck, preventing frustrating and costly repairs that result from foreign fluids in the DEF tank.
Direct replacement for an OE-equivalent fit; Meets or exceeds all regulatory requirements; Constructed from high-quality, heat-resistant materials for a long service life; Vehicle try-on testing and vibration testing to ensure trouble-free performance