Homelite Carburetor Kit part# 03172 is made for a Zama Carburetor. This kit is used on the following Homelite String Trimmer models; HBC38, HBC40, PBC3800, and, PBC4000. Even if your model is listed here, all Homelite parts are UT and/or serial number specific. Please refer to a parts breakdown for your particular model and UT number to assure that this is the correct part for your machine before you order.