For use with 2-cycle and 4-cycle hand held equipment. For Troy-Bilt, Craftsman, Homelite, John Deere, Ryobi, Bolens, Yard-Man, Ryan, Yard Machines, Husqvarna and Stihl models. Fits many Zama, Walbro, Shindaiwa, Stihl and Homelite carburetors. Fits all 2-cycle and 4-cycle Zama carburetors. Fits many Zama, Walbro, Shindaiwa, Stihl and Homelite carburetors (No 0057004), fits Walbro models WA, WT, WY, WYJ, WYK, WYL, WYP & WZ carburetors that require a 0.755 in OD x 0.560 in HT primer bulb (No 188-12), Fits HDA models and WYK carburetors that require a 0.680 in ID x 0.912 in OD (No 188-13). Also replaces Walbro No 188-14, Echo 12318140630, Homelite UP-04802, 01201, McCulloch 225834-00, Shindaiwa 20036-81670 and Stihl 4133 121 2700. Also replaces Green Machine 4467213, Homelite 01201, UP04802 and Red Max 1491-61510.