Poweka 683974 Primer Bulb Ryobi Walbro Homelite188-512-1 Wt-23a Wyj-33 Wyj-86 Ryobi 791-683974 B 683974 Replace Stens 615-764 Craftsman Weedeater Trimmer(Pack of 5) New high quality aftermaket replacement parts Replace oem part number: Ryobi 683974 Replace ryobi 791-683974 B Replace walbro 188-512, 188-512-1 Package includes 5pcs x primer bulb