From Gast Group

In reciprocating motion,
with a short stroke, the
diaphragm at the top of
the connecting rod flexes up and down in a closed
chamber, creating pressure or vacuum.
Even at maximum duty, output air is cool and oil-free.
As ambient air enters and leaves the head, it never
goes near the motor to pick up heat and foreign matter.
Cooler temperatures add to overall efficiency and
service life.
The connecting rod is bonded to its bearing - not
clamped as in lighter duty pumps. So, you get greater
strength and durability where work loads are greatest.

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Air compressors are machines that compress air to higher than atmospheric pressures for delivery to pneumatic or robotic tools, industrial equipment, or direct-use applications.
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Compressed air filters are used to remove water, oil, oil vapor, dirt, and other contaminants from a compressed air supply.

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