Patent ID: 7278442

Claim:
Port-cap for a fire-hydrant, wherein: the port-cap is so structured that the port-cap can be fastened to, and can close-off, a hose-port of a fire-hydrant; the port-cap is so structured that the port-cap can be unfastened from, and removed from, the hose-port; the port-cap includes an air-hole, which, when the port-cap is fastened to the hose-port, connects the interior of the barrel of the fire-hydrant to the outside atmosphere; the port-cap includes a check-valve; the check-valve is arranged in the port-cap to open the air-hole when the atmospheric pressure outside the fire-hydrant exceeds the pressure inside the barrel of the fire-hydrant; the check-valve is arranged to close the air-hole when the pressure inside the barrel exceeds the pressure outside; and the port-cap includes an air-hole-cap, which is arranged to cover the air-hole in the port-cap.