| http://www.w3.org/ns/prov#value | - According to one embodiment, the mechanical coupling is a rod that includes a serrated surface 230 configured to engage the gear 228, a first engagement surface 232A to engage the first valve 216A, and a second engagement surface 232B to engage the second valve 216B. In one embodiment, each valve 216A, 216B includes a diaphragm (234A, 234B, respectively), an overseal (236A, 236B, respectively), a
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