The Genuine The Genuine Briggs BA21014 Flush Valve comes complete. It has the flapper with the chain and hook. Therefore it is ready to connect to the lever. However the rubber seal which prevents leaks also comes with this valve. This flush valve is for the model 6045 once piece toilet. Therefore the mounting hardware for the valve also comes with it. 

This valve comes with the flapper. However the flapper is plastic. Also the flapper comes with the rubber seal. Therefore it will prevent leaks into the bowl. The flush valve itself is plastic. Therefore it will not rust and will last longer. The chain and hook on the flapper connect to the lever. Therefore when the lever is pushed it will lift the flapper. Causing a flush. 

In conclusion, the Briggs BA21014 Flush Valve comes complete. It has the flapper which also comes complete. Therefore it has the chain and the hook. Also the mounting hardware comes with the valve. This secures it to the tank. In addition to the hardware, the gasket also comes with it. Which prevents leaks in between the tank and the flush valve. 

• Genuine Briggs replacement part
• Comes complete with flapper
• The Mounting hardware included
• Rubber gasket
• Chain and hook for the flapper