Hand Pump (from Internet Glossary of Pumps)
Hand Pump
This pump is used for hand lotions, i.e. thick (high viscosity) liquids.

There are two metal balls inside this pump. The large lower ball fits inside the first few turns of the spring. The middle turns of the spring are of reduced diameter so they act as a stop for the ball.

This particular version of hand pump is patented by Calmar, Inc. though many fairly similar pump mechanisms exist.

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Last modified February, 2002
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