Poweka Primer Bulb Pump 188-512 for Poulan P4018AV-BH P4018WM P4018WT P4018WTL PP3516 Pro PP3516AVX PP3816 PP3816AV PP4018 Pro PP4018 Pro PP4218 PP4218AV PP4218AVHD Gas Saw Fits Poulan 35879158 35879558 35879898 3587952 35879556 35879516 3587958 35879518 Fit HOMELITE HLT28 ST145 ST155 CS50 CS4018 CS5020 D4150B D450B D4550BC CS40 Replace manufacturer part number: 188-512, 188-512-1 Fit CRAFTSMAN RYOBI UP04033 300780004 300780001