Universal Priming Pump 188-12 188-12-1; Bulb has no center hole; For Homelite 01201 UP04802, Stihl 4133-121-2700 4226-121-2700, Poulan 530035361, Echo 123-3-181-40630 123-181-09560, McCulloch 225834-00, Shindaiwa 70029-81480 20036-81670… (non-exhaustive list) ; universal