Patent ID: 8651315

Claim:
A pressure tank, comprising: a metallic vessel; a plastic liner enclosed by the metallic vessel, the plastic liner having a cylindrical sidewall, the cylindrical sidewall having a continuous inner surface; and a first through-wall connector including: a tubular body having an inner tubular portion, the inner tubular portion passing through the metallic vessel and the cylindrical sidewall of the plastic liner, the inner tubular portion having a neck section at an end thereof; a washer placed around the tubular body and sandwiched in between the metallic vessel and the cylindrical sidewall of the plastic liner; a retainer ring placed around the inner tubular portion of the tubular body and having a disk-like flat portion, an annular wall portion extending outward from outer periphery of the disk-like flat portion and a flat flange portion extending outward from a peripheral end of the annular wall portion, the flat flange portion being in contact with the continuous inner surface of the cylindrical sidewall of the plastic liner, wherein the retainer ring, the continuous inner surface of the cylindrical sidewall of the plastic liner and the inner tubular portion co-define an accommodation; and an O-ring placed around the inner tubular portion of the tubular body, received in the accommodation, and sandwiched in between the retainer ring and the continuous inner surface of the cylindrical sidewall of the plastic liner, the O-ring having a first peripheral area contacting with the continuous inner surface of the cylindrical sidewall of the plastic liner, a second peripheral area contacting with the annular wall portion of the retainer ring and a third peripheral area contacting with the disk-like flat portion of the retainer ring; wherein the neck section of the inner tubular portion of the tubular body is bent to hold the disk-like flat portion of the retainer ring.