| 摘要 |
Various embodiments of a device for regulating a fluid flow are described that can include first and second downwardly-sloping valves that are biased in a closed position to prevent odors from escaping the device. The device can also include first and second downwardly-sloping valve seats, and configured such that an end portion of the first valve can be seated beneath the first valve seat and an end portion of the second valve can be seated beneath the second valve seat when the first and second valves are in a closed position, respectively. |
