HIPA (Pack of 3) Primer Bulb for STIHL TS410 TS410Z TS420 TS420Z Concrete Cut Off Saw 4238 350 6201 Replacement manufacturer part number: 4238 350 6201 Compatible with STIHL TS410 TS410Z TS420 TS420Z concrete cut off saw Package include: 3pcs primer bulb