This is an OEM replacement Gas Ballast Filter for Edwards E1/E2M series rotary vane pumps. This small felt filter fits inside the gas ballast valve assembly. It cleans the air that enters the pump during gas ballast operation. It fits E1M18, E2M18, E2M28, and E2M30 models . This filter is also compatible with the E1M40 and E1M80 pumps .
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