Patent ID: 7819341

Claim:
Paint reservoir system for a paint spray gun including an open top container and a cover having a spout that can be set on the container to close the top, the spout of said cover being mountable on a paint spray gun for gravity feed of the paint from the container to the spray gun; a first through member sealed by a readily puncturable membrane is formed integrally in a wall of the container for establishing a sealed but readily puncturable ventilation opening; said membrane consisting of a material with one of (i) a lower strength than the material of the container wall and (ii) a smaller thickness than the container wall; a second member being slidably receivable in said first through member and having a tapered forward end that can puncture said membrane and an enlarged rear end that can engage the first through member; said second member being positionable in said first through member in a first position in which the membrane has been punctured and the second member forms an airtight seal with the first through member, and in a second position in which the membrane is punctured, the second member is partially withdrawn from said first though member and an air passage is formed between the first and second members enabling air relief of the container.