This is a A-B1W188512 Primer Bulb PN: B1W188512Main Description As Following : A-B1W188512 Primer Bulb P.N: B1W188512 External Mount. OEM Walbro. Crossed From: PT15396 JOHN DEERE , 01123 HOMELITE , 01123 JACOBSEN , 07-073 OREGON , 07073 OREGON , 11510 ROTARY , 123-181-39130 ECHO , 123181-26030 ECHO , 12318126030 ECHO , 12318139130 ECHO , 188-12 WALBRO , 188-12-1 WALBRO , 188-12-8 WALBRO , 188-512 WALBRO , 188-512-1 WALBRO , 18812 WALBRO , 188121 WALBRO , 188128 WALBRO , 188512 WALBRO , 1885121 WALBRO Found in Section & Models : Sunbelt - Carburetion > OEM Walbro, Walbro CARBURETOR: WT-23A, Walbro CARBURETOR: WYJ-33, Walbro CARBURETOR: WYJ-34, Walbro CARBURETOR: WYJ-45, Walbro CARBURETOR: WYJ-86, Walbro CARBURETOR: WYJ-92, Walbro CARBURETOR: WYJ-94, Sunbelt - Fuel > Fuel Line/Accessories, Walbro CARBURETOR: WA, Walbro CARBURETOR: WT, Walbro CARBURETOR: WT-23A (External Mount, Snap in type.), Walbro CARBURETOR: WYJ-33 (External Mount, Snap in type.), Walbro CARBURETOR: WYJ-34 (External Mount, Snap in type.), Walbro CARBURETOR: WYJ-45 (External Mount, Snap in type.), Walbro CARBURETOR: WYJ-86 (External Mount, Snap in type.), Walbro CARBURETOR: WYJ-92 (External Mount, Snap in type.), Walbro CARBURETOR: WYJ-94 (External Mount, Snap in type.) Associated Items : New Also This is An Aftermarket Product And : External Mount. OEM Walbro.