G45L Cylinder Kit compatible with models G45L BC4310 BK4310 40mm for 443R 143R.This cylinder kit includes all necessary components for replacement or repair.Designed to fit specified engine types, it supports proper function and performance when installed correctly.The kit is intended for use in small engine applications and provides a complete solution for cylinder overhauls. Compatibility Note: This is a third-party part.All brand/model references are for fitment purposes only.