Honda OEM radiator cap, 19045-692-003, for 1975 to 1987 but DOES NOT fit Limited and SEI and GL1200 1987 Aspencade. Pictures shows two views of the cap but is sold as each.

Maintenance schedule: Honda advises inspecting the radiator and coolant core every 8000 miles or 12800 km. Replace your coolant every 2 years or 24,000 miles - whichever comes first.