Part A356000031, Check Valve, is a genuine OEM part manufactured by Echo. The manufacturer describes it as "VENT ASSEMBLY". Fuel tank vent (also called a check valve). The fuel tank vent allows air to re-enter the fuel tank. If the vent is clogged, the engine may stall. It is used in Zama Small Engines. Find appliance parts, lawn & garden equipment parts, HVAC parts and more from the top brands in the industry.