Patent ID: 8510876

Claim:
A first type drain valve device for a cleaning water tank which stores a cleaning water for cleaning a toilet bowl, said first type drain valve device comprising: a first type drain valve main body including a supporting shaft extending in a horizontal direction and a valve seat attached to a draining port formed at a bottom surface of the cleaning water tank; and a first type drain valve including an engaging portion which engages with the supporting shaft and is capable of swinging in a vertical direction, and a valve body, connected with the engaging portion through an extending portion, for carrying out a water discharge and a water stop when contacting with or separating from the valve seat by swinging in a vertical direction, wherein said first type drain valve main body includes a first projection which projects upwardly, when said first type drain valve is attached to the first type drain valve main body, the first type drain valve main body enables carrying out a water discharge and a water stop, without the first projection abutting against the first type drain valve, and when a second type drain valve provided with a second projection is attached to the first type drain valve main body, the first type drain valve main body disenables carrying out a water stop, with the first projection abutting against the second projection of the second type drain valve; wherein said second projection of the second type drain valve is provided at the extending portion of the second type drain valve.