Features: Ensure optimals performances of your lawn mower with our (2pack) 503936601 188 512 Primer Bulb Pumps, designed to provide a stable fuels supply for small engines. Crafted from durable materials, these primer bulbs extend the lifespans of carburetors and feature a universal design compatible for various lawn mower brands. Ideal for home gardening enthusiasts who prioritize equipment maintenance and professional landscapers requiring frequent use of lawn mowers. Perfect for maintaining home gardens, trimming lawns, and supporting daily gardening activities, as well as essential in garden engineering projects for lawn equipment upkeep. Easy installation without the need for professional skills makes these primer bulbs practical for anyone looking to maintain their outdoor power tool efficiently. Specifications: Component:Plastic+Metal Size:Approx.21x21x34mm/0.83x0.83x1.34inch Diameter:Approx.15mm/0.59inch Fits for PPB100E PPB150E PPB200 PPB250E PPB300E PPB350 SM1321 35879158 3587952 35879516 358795835879518 Replaces Part 188-512, Universal snap in Primer Bulb for Trimmers Blowers & Chainsaws Compatible for 125B 125BX 125BVX 225BX 225HBV 356BF 356BT 235 235E 236 236E 240 240E 123L 225 232L 227L 227LD 227R 227RD 240L 322C 322L 322R 323 325 325LX 325LXT 325RX 325RXT 325RDX 325RJX 325CX 326 326C 326L 326LX 334T 338XPT 340E 345 346XP 350 350EPA 353 435 435E 440E 445 445E 450E 455 455E ,460 chainsaw Replace part number:Wal-bro 188-512 188-512-1; 503936601 530047721;530047721,12318139130 ,01183 300780002 Package Includes: 2pcs Primer Bulb Pumps note: Please allow 1-10mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.