Typically made of die cast aluminum, and not coated inside or out for corrosion resistance.
Water separation is created by centrifugal motion (spinning the air)
Does not work well with intermittent or low air flow because the moisture carries over.
Short separation distance between the air inlet and filter element, also causing moisture build up.
Very small size causes them to plug easily and create a high pressure drop.
Requires frequent replacement
Manual drains are standard on most filters, with float drains offered as an optional expense. The manual drains are also difficult to replace and labor intensive.
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