Direct replacement coolant cap for Hyundai vehicles (part number 25441B1000) that restores cooling system pressure, prevents leaks, and fits OEM specifications. Key benefits Reliable sealing: Precision threading and grade materials maintain correct cooling system pressure to reduce overheating risk and prevent coolant loss. Simple maintenance: Userfriendly grip and clear 'COOLANT' marking make identification and replacement quick and straightforward during routine service. Longlasting performance: Heavyduty plastic construction stands up to underhood temperatures and pressure changes, reducing the need for repeated replacements. Exact fit: Designed as a direct replacement for vehicles using part number 25441B1000, ensuring proper fit and function without modification. What it does and why you need it Function: Replaces a worn or damaged coolant cap to keep the pressurized cooling system sealed and operating at the correct pressure. Problem solved: Stops coolant leakage and pressure loss that can cause engine overheating, air entry into the cooling system, and premature component wear. What makes it stand out: Combines precise threading, durable materials, and a visible marking for fast, reliable service. Compatibility Direct replacement for Hyundai models that use part number 25441B1000: Sonata, Nexo, Genesis G80, Genesis G90, Optima, Cadenza, and K900. Material and performance Material: Heavyduty automotivegrade plastic engineered to resist heat and pressure cycling. Performance: Maintains seal integrity under typical engine operating temperatures and pressure variations encountered in normal driving. Installation Easy to install by hand; align threads and tighten until secure. The grip design speeds removal and installation during inspections or repairs. Use scenarios a cracked or leaking coolant cap found during a homeowner or inspection to stop visible coolant loss and restore proper system pressure. Install before a long road trip to reduce the risk of overheating and ensure the cooling system is sealed and functioning. Swap during routine coolant system maintenance or when flushing the radiator to ensure the cap maintains correct pressure after refilling. Note: Intended as a direct replacement for caps identified by part number 25441B1000. Confirm compatibility with your vehicle before .