This product is a 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 compatible with OEM numbers 121661210 and CM146601. Compatibility Disclaimer: This is an aftermarket replacement part. Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.