Abstract: A ball valve for a ball valve assembly having a housing with a housing sealing surface configured to selectively seal against the ball valve. The ball valve includes an outer sealing surface configured to selectively seal against the housing sealing surface, and a recessed surface set inward of the outer sealing surface and defining a reservoir within the outer sealing surface. As the ball valve rotates between open and closed positions, the reservoir establishes a gap between the recessed surface and the housing sealing surface that enables debris to pass therethrough and facilitate preventing debris accumulation between the ball valve and the housing sealing surface.

Abstract: In accordance with the present invention, a liner for a hat, cap or similar head covering comprises a layer of moisture absorbent material which is backed by a layer of moisture impervious material. Further, adhesive means are provided for releasably securing the liner to the sweatband of the hat, cap or similar headgear. The bottom and side edges of the moisture absorbing layer are sealed to prevent the migration of moisture, oil, grease and other contaminants through these edges of the liner. The upper edge of the liner is left unsealed so that a wicking action encourages the transport of moisture from the body of the moisture absorbing layer to the top edge where it may be evaporated.