| http://www.w3.org/ns/prov#value | - In this embodiment, the means for affixing the rod and the piston include means for securing the rod and the first piston wall, so the piston and rod move integrally, and including means for sealing the interface of the rod and wall at the aperture to seal the interface, which two functions may be fulfilled by welding, for example, or with a threaded nut arrangement and seals or welding.
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