HIPA Snap in Primer Bulb Pump 188-512 for Poulan WT3100 31WG BC3150 PP031 PP033 PP035 PP036 PP131 PP135 PP136 PP331 PP335 PP336 PPB100 String Trimmer Replace manufacturer part number: 188-512, 188-512-1 CRAFTSMAN RYOBI UP04033 300780004 300780001 Fits Poulan 35879158 35879558 35879898 3587952 35879556 35879516 3587958 35879518 HOMELITE HLT28 ST145 ST155 CS50 CS4018 CS5020 D4150B D450B D4550BC CS40 Please compare the sizes with your old bulb carefully, make sure it fit