Patent ID: 8231993

Claim:
A flow cell battery, comprising: a flow cell; at least one holding tank, coupled to the flow cell, containing an electrolyte composition that is provided to the flow cell during use; and a tubing assembly, comprising an outer tube, the outer tube having corrugations of a first pitch and low permeability to gasses, the corrugations extending along an entire length of the outer tube; an inner tube received in the outer tube, the inner tube comprised of an elastic material and having corrosion resistance to liquids and gasses; and a first insert, the first insert including a first section with an outer surface having annular teeth thereon, the annular teeth having a second pitch related to the first pitch such that the distance between two adjacent annular teeth is a non-zero integer multiple of the distance between two adjacent corrugations of the outer tube, wherein: the first section is received by the inner tube such that the annular teeth engage with the corrugations, the annular teeth cause areas of the inner tube to deform, and the deformed areas are generally received in the corrugations.