An electrical connector includes an insulating housing, a number of power contacts and a number of signal contacts received in the insulating housing, and a power bus bar electrically and mechanically connecting with one power contact. A spacer that supports the bottom is produced as a single piece with the lid, whereby the G-rotor pump can be embodied in a particularly inexpensive manner. The diaphragm is designed to retain a column of waste water in the drain trap to balance the negative pressure inside the air conditioner, while the cuts are such that when the column of waste water exceeds a predetermined height or volume, the excess waste water drains out through the diaphragm to maintain the column of waste water at the predetermined height or volume. Each filter segment may include a filter material having a finish composition formulated to selectively interact with a different target component. By overdetermining position, for example, clock biases can be removed from the system.