Air filter case base. For Yamaha gas 1996-up G16,G21,G22,G23,G27,G29 Drive Cross Reference Part #''s rd858sk*;FLT YA E4411 B1;7836 ;JN6-E4411-00 YA;JN6-E4411-01 YA;JN6-E4411-02 YA;JU0-E4411-00-00 YA