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Your SX-135 string trimmer was built by Homeliteand has a model number of UT-20601. That said, your trimmer's primer bulb part number depends on teh type of carburetor it has. If your trimmer has a Walbro carburetor, the primer bulb part no. is 01201. If it has a Zama carburetor (the most likely one) the primer bulb part no. is A01195A.