The 2pcs 503936601 Primer Bulbs are designed specifically for various Husqvarna models such as 455 Rancher, K760, K750, 460, 445, 450, and 435, offering compatibility with other brands like Ryobi, Stihl, and Poulan as well. 

These primer bulbs play a crucial role in the fuel system of your power tools, aiding in the starting process by supplying the carburetor with fuel. Made with quality materials to ensure durability, these replacements offer a reliable and efficient solution to worn-out or damaged primer bulbs. Easy to install, these primer bulbs provide consistency and optimal performance for your tools.