A Zama Carburetor from a Craftsman Model # 358.351900 Sim-pul Chainsaw. 42cc engine 18 inch bar.  This is a non-working carburetor, considered to be a rebuildable core.  It comes with the linkage and used filter fuel pick-up shown.   This part may fit on other models and brands but you must do your own fitment check prior to purchase.  I will be happy to answer any questions about this part but do not have a cross-fit list for parts.