FITS FOR ECHO CS-400 PARTS , Air Filter Replaces # 13030039730 90155 90155Y 90109. FITS FOR CS-400 ECHO CHAINSAW PARTS , fits for ECHO CS370 CS370F CS400 CS400F CS420ES CS3500 CS4200ES CS5000 Chainsaw. FITS FOR ECHO CS400 PARTS , Compatible with Echo Models: CS-370 CS-370F CS-400 CS-400F CS-420ES CS-3500 CS-4200ES CS-5000 Chainsaw. ALL-IN-ONE KIT: Echo cs400 tune up kit saving you time and money on individual purchases. 99% FILTERATION EFFICIENCY: The echo cs400 air filter 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 a HIPA cs400 air filter for unclogged, smoother airflow, ensuring higher horsepower and enhanced performance. LEAK-PROOF SEALING DESIGN: The echo cs 400 air filter 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 cs-400 air filter into place a seamless DIY replacement that no tools needed. DIMENSIONS FITS FOR ECHO CS-400 CHAINSAW AIR FILTER: Outside Diameter 2-1/2", Inside Diameter 1-3/4", Overall Height 1-3/16". PACKAGE INCLUDE: HIPA 13030039730 air filter x1, primer bulb x1, fuel filter x1, spark plug x1.