| http://www.w3.org/ns/prov#value | - In this connection the floating head piston 78 is preferably fabricated of a relatively light-weight material, such as aluminum, and is maintained in its requisite position within the bore as a result of a friction-fit provided by the O-ring seal 84, which again is preferably fabricated of a fluoro-elastomer material, such as Viton.
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