Patent ID: 7216673

Claim:
A non-metallic, diaphragm-type tank assembly for use with a pressurized water system, the tank assembly comprising: a non-metallic outer body; a non-metallic inner shell assembly, including an upper portion and a lower portion, that is contained by the non-metallic outer body; a diaphragm that is structured and arranged on an inner side of the inner shell assembly near a point of connection between the upper and lower portions of the inner shell assembly to separate the inner side of said inner shell assembly into a water portion and a pressurized gas portion; an inner clamp hoop that is structured and arranged to press its outer periphery against the diaphragm; and an outer band that is structured and arranged coaxially with the inner clamp hoop, wherein the inner clamp hoop and outer band can be crimped or pinched to compress and secure the inner shell assembly and a bead portion of the diaphragm between the inner clamp hoop and outer band to provide a watertight chamber between the diaphragm and the lower portion of the inner shell assembly.