YOU ARE BIDDING ON A NEW  OS C/L VENTURI AND NVA SET NIP. FOR OLD MAX ENGINES SECOND MODEL CRANKCASE WITH 8.84 CRANKCASE OPENING. . THIS IS A 3.5 MM SPRAYBAR SO A 3.5 MM BIT IS INCLUDED TO DRILL OUT TO FIT.INCLUDES O RING. SEE PHOTOS. THIS FITS 20-25 SECOND MODEL CRANKCASE TYPE ONLY WITH 8.84 MM BASE. Check out my other items!Be sure to add me to your favorites list! ANY QUESTIONS??? 9542340863 Bob