This radiator cap is compatible with Accord models from 1994 to 2006 and Civic models from 1992 to 2005.It also functions as an oil tank cap, replacing part numbers 19045-P08-013 and 19045-PWA-004.The cap is engineered to maintain appropriate pressure in the cooling system and help prevent coolant loss.It provides a secure seal on the radiator or oil reservoir for consistent performance under normal operating conditions.