Need a new coolant reservoir cap for your Acura or Honda? This is the genuine OEM cap that seals your radiator overflow tank. It fits a ton of models: Acura CL, RL, TL, MDX, RDX, RLX, TSX, ZDX, and likely some Honda vehicles too. Made in Japan with that factory quality you expect. The part numbers are 19102-PM5-A00 and 19106-RNA-A00 – cross-reference with your old cap to be sure. It’s made of durable plastic, designed to withstand heat and pressure. This isn’t some cheap aftermarket piece; it’s the real deal, so you won’t have to worry about leaks or pressure issues. Easy to install – just twist off the old one and twist this one on. Placement is on the front of the engine bay, on the coolant recovery tank. Comes brand new in original packaging, with a manufacturer warranty. Not a universal fit, so check your model year. A small but crucial part for keeping your cooling system running right. Don’t let a bad cap cause overheating – replace it with this genuine piece and drive with confidence.