ONAN Gas Marine Generator Harmonic Balancer General Description   Used Item. This item is off an ONAN Gas Marine Generator Model # 3MAJBA 1B Serial # L880193255 This item may fit other models but I do not know what. It is always recommended to replace service items on used items, such as (but not limited to) seals, gaskets, o-rings, impellers and flappers on pipes, as these items wear easily and should be replaced on a regular scheduled basis. If you need to order these items, please contact us to see if we have them in stock. To view our policies, including return policy, please click button below. Summer Hours (Memorial Day – Labor Day) Store Hours: Monday – Friday 9:00 – 5:00 Saturday 9:00 – 12:00 Regular Store Hours: Tuesday – Friday 9:00 – 5:00 Saturday 9:00-12:00 Sunday – Monday Closed Please note, we ship on Tuesday-Friday We offer a variety of UPS and USPS shipping options! International Shipping, please note: You are responsible for any additional taxes or tariffs charged by customs or your country. Please E-mail us with any questions you may have! ATTENTION WA STATE RESIDENCE: State Law requires us to charge sales tax. Sorry, NO EXCEPTIONS!