FITS FOR ECHO CS400 AIR , Air Replaces # 13030039730 90155Y. FITS FOR ECHO CS 400 AIR , Fit for Echo Models: CS370, CS370F, CS400, CS400F, CS420ES, CS3500, CS4200ES, and CS5000. FITS FOR ECHO CS-400 CHAINSAW AIR , Compatible with Echo Models: CS-370 CS-370F CS-400 CS-400F CS-420ES CS-3500 CS-4200ES CS-5000 Chainsaw. [99% FILTERATION EFFICIENCY]: The echo cs-400 air is made of multi-fiber, high-density media, designed for low flow resistance. It effectively captures 99% airborne particles and has a superior dirt holding capacity. [QUICK PERFORMANCE ENHANCEMENT]: Upgrade to acs400 air for unclogged, smoother airflow, ensuring higher horsepower and enhanced performance. [LEAK-PROOF SEALING DESIGN]: The echo cs-370 air uses a leak-proof polyurethane resin frame design, seamlessly fitting to prevent unfiltered air from entering the engine. [EASY TO INSTALL]: Effortlessly Slip the echo cs370 air into place—a seamless DIY replacement that no tools needed. [DIMENSIONS FITS FOR ECHO CHAINSAW AIR CS400]: Outside Diameter：2-1/2", Inside Diameter：1-3/4", Overall Height：1-3/16". [PACKAGE INCLUDE]: 13030039730 air x2.
