Magnet set for HK40. The magnet is the part that moves
back and forth with the diaphragm therefore it has the role of holding the
diaphragm secure. Normally the magnet is long-lasting, yet if you if you run
the air pump with bad diaphragms for extended periods the magnet can deteriorate.
If you open the motor for repair and find dust or small metal bits then this
may be a sign that the magnet needs to be replaced. It is important to examine
the magnet for wear and tear when replacing your diaphragms. These magnets can
be very easily replaced.