Patent ID: 7364905

Claim:
An article comprising: an enclosure defining a sealable volume that receives fluid, wherein said enclosure has a first aperture and a second aperture; a membrane. wherein said membrane is disposed in the enclosure, and further wherein said membrane segregates the volume defined by the enclosure into a first chamber and a second chamber; a first feed fitting, wherein said first feed fitting is received by said first aperture; a first spring-biasing element, wherein said first spring-biasing element mechanically couples to said first feed fitting; a second feed fitting, wherein said second feed fitting is received by said second aperture; and a second spring-biasing element, wherein said second spring-biasing element mechanically couples to said second feed fitting; wherein: said first spring-biasing element, said first feed fitting, said first aperture, said second aperture, said second feed fitting and said second spring-biasing element are aligned along a first axis.