Savior 5 Pack of Snap in Primer Bulb Bulbs Pump 188-512-1 for Poulan Ryobi Homelite Sears Blower Weedeater Trimmer Replace Craftman 561635001 MTD 791-683974 683974B TORO 791-181558 791-683974 high quality aftermaket replacement primer bulb Replace 188-512 188-512-1 Refer to Part No.: 01183, UP04033, 300780001, 300780002, 300780004, 530047721 Height x Wide:1.236"(31.4mm) x 0.842"(21.4mm)