Check the listing for details. WARING 503604 NEW STYLE REPLACEMENT SQUARE DRIVE COUPLING MX SERIES XTREME. Condition: New. Listed at 36.00 USD. * GENUINE FACTORY ORIGINAL OEM REPLACEMENT MOTOR COUPLING FOR ALL MX1000 THROUGH MX1500 SERIES WARING BLENDERS * FITS ALL VERSIONS WITH POST PRODUCTION DATE OF MAY 07, 2021 * NOT TO BE USED ON OLDER VERSIONS WITH ROUND THREADED RECEPTACLE * THREADS OFF COUNTERCLOCKWISE, THREADS ON CLOCKWISE * TIPS FOR LONGER LIFE: 1. ALWAYS MAKE SURE JAR IS SECURED IN POSITION BEFORE STARTING MOTOR 2. NEVER PLACE OR REMOVE JAR WHILE MOTOR IS IN MOTION 3. WHENEVER POSSIBLE MAKE SURE THAT LIQUID IS PRESENT AND ADDED FIRST WHEN MIXING DENSE AND FROZEN ITEMS TO REDUCE STRESS ON BLADE AND COUPLING 4. REPLACE BLADE AND BEARING ASSEMBLY (503397, AVAILABLE THROUGH OUR EBAY LISTING #154205712943) ONCE A YEAR WITH HEAVY USE, (A DULL AND WORN BLADE/BEARING ASSEMBLY INCREASES STRAIN ON COUPLING AND MAKES FOR INCREASED RUN TIME FOR POORER RESULTS). ALTERNATIVELY, WE ALSO OFFER THE BLADE/BEARING JAR ASSEMBLIES, (LESS LID WHICH IS INTERCHANGEABLE IN BOTH SIZES) IN 48 OUNCE, PART #503439, OUR EBAY LISTING #152124419584, AND 64 OUNCE, PART #503398, EBAY LISTING #153957564454