Compatible with HUSQVARNA 545, 550XP, 455 chainsaws, and compatible with Walbro AT1 and AT7 models carburetor. . Reliable Replacement: Direct replacement for D1-AT diaphragm kit, designed to restore carburetor performance and maintain smooth engine operation. Durable Material: Made of quality composite materials for fuel resistance, wear resistance, and long service life. Stable Performance: Ensures proper fuel flow regulation and consistent engine performance, improving efficiency. Convenient Kit: Complete diaphragm repair kit, easy to install, ideal for maintenance or repair of chainsaws., Manufacturer: OTOTEC