This product is a replacement diaphragm carburetor membrane designed for specific 50cc 4T scooter models. It is compatible with the following models FLY 4T 2V 50 2013-2015 RP8C523 FLY 4T 50 2005-2007 C44200 FLY 4T (MOTOR CHINA) 50 2006-2007 C44500 FLY 4T 2V 25-30KM-H 50 2012-2017 RP8C522 FLY 4T & 25-30 KM/H 50 2008-2011 C44500 LIBERTY 4T RST 50 2004 C42200 LIBERTY 4T SPORT 50 2007-2008 C42405 LIBERTY 4T DELIVERY TNT 50 2009 C42401 LIBERTY 4T DELIVERY - SINGLE 50 2010-2014 C42401 LIBERTY 4T 50 2005-2008 C42400 LIBERTY 4T PTT - DOUBLE - NEXIVE 50 2009-2017 C42402/C42404 LIBERTY 4T PTT (DEU) 50 2007-2012 C42406 LIBERTY 4T 50 2000-2002 C2800 LIBERTY MOC 4T & ELLE 50 2009-2016 C49200 LIBERTY 4T SPORT 50 2006 C42405 ZIP 4T 25KM-H 50 2006-2016 ZIP 4T 50 2006-2013 LBMC25C ZIP 4T 50 2000-2005 C25000 This part is designed to match the specifications of OEM number 121661210 CM146601. It is intended for use in the carburetor system of the specified scooter models to ensure proper fuel flow and engine performance. Compatibility Disclaimer: This is an aftermarket replacement part. Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.