Patent ID: 6976448

Claim:
A restriction indicator for an air cleaner system of an internal combustion engine, the restriction indicator comprising: a) a housing; b) a diaphragm dividing the housing into first and second chambers, the first chamber being vented to atmosphere and the second chamber being adapted to be connected in fluid communication with the air cleaner system; c) a signal member connected to the diaphragm, the signal member being moveable along an axis between a reset position and a first indicator position, the signal member defining an axial opening within which a first retaining shoulder is located; d) a guide member for guiding the signal member as the signal member is moved between the reset position and the first indicator position, the guide member defining a guide opening that extends along the axis and is sized to receive at least a portion of the signal member; e) a retaining member for retaining the signal member in the first indicator position, the retaining member being generally not movable relative to the housing in an axial direction, the retaining member extending within the axial opening of the signal member and including a least two fingers that project radially outward from the axis, the fingers being configured to engage the first retaining shoulder to retain the signal member in the first indicator position; and f) a reset button for deflecting the fingers radially inward to disengage the fingers from the first retaining shoulder thereby allowing the signal member to be returned to the reset position, the reset button including a portion that extends within the axial opening of the signal member between the retaining member and the signal member.