This is the genuine Onan original carb. Beware of the cheap Chinese knock offs. Before you buy this or ask questions please identify your carb by getting the part number off the side of it. I need the 146-#### 7-digit number before I can help you. This will save you and me lots of time. CARBURETOR ONAN 146-0414 ONAN BOOK CROSS REFERENCES THIS TO FITS Miller Onan Engine P126G, P128G, P220G, OL16,OL18,OL20, LX720,LX 770,LX790,All Specs except 21112 Also fits Industrial Engines B48G-GA020, B48G-GA19.9 MAY ALSO FIT CERTAIN B48M ENGINES, CHECK YOUR NUMBERS SAME AS 146-0479 and 146-0496 ALL NUMBERS ABOVE REPRESENT THE SAME CARB MARKED NIKKI JAPAN 6100 27-091 7ZD Larger opening is 2-1/32" OD and the smaller opening is 1-1/16" ID. Mounting holes are 2-3/8" on centers. WINNER PAYS ONLY $8.89 shipping and handling in USA Please put me on your favorites. I will continue to list new items from time to time. I have other ONAN CARBURETORS in my STORE. On May-01-06 at 17:02:23 PDT, seller added the following information: THIS CARBURETOR HAS HAD THE FOLLOWING PART NUMBER CHANGES OVER THE YEARS. ORIGINALLY IT WAS 146-0414 THEN IT WAS CHANGED TO 146-0479 NOW IT IS 146-0496. ALL PART NUMBERS REPRESENT THE SAME CARB application. . Send your Onan model and spec number when looking for parts. for help WITH YOUR INQUIRIES. ask me for help ... MIKE Don't forget to click on SEE ALL CATEGORIES in the left hand navigation bar. IF YOU NEED TO CONTACT THE SELLER BY PHONE, PLEASE FOLLOW THESE INSTRUCTIONS: *FROM A DESKTOP COMPUTER, GO TO THE ITEM THAT YOU HAVE QUESTIONS ABOUT. *CLICK "CONTACT SELLER" LOCATED ON THE RIGHT SIDE OF THE PAGE, UNDER SELLER INFORMATION. *SELECT THE "OTHERS" OPTION. *CLICK "VIEW PHONE NUMBER".