this is the carb seal kit for the 70-78 ATC90s  we recommend every carb rebuild gets one of these kits they come with all the hard to find parts that do not come in the standard carb rebuild kit , mainly crucial parts to repair the carb bowl such as the fuel petcock rubber block and tension spring  and the brass filter screen and o ring .  every carb rebuild should get one of these  and its all factory Honda so its the best quality