(To be installed above the air eliminator) Viton seal - all stainless steel
This small item offers possibly your greatest protection against Big Trouble! Prevent entry of air to the filter vessel through the air eliminator when main piping check valves leak. Insures that the vessel remains full of fuel. Prevents fuel pressure surging that damages elements.
Air carries micro-organisms that grow to contaminate fuel system filter and tank pumps. Also, without air, there can be no internal fires in filter separators; when a pump forces fuel through a coalescer into an empty filter separator, every requirement for fire is present - oxygen, fuel spray and high energy static charges.