Abstract: An adapter includes a substantially rigid body having a distal portion, a proximal portion, a central opening formed at least in part by an inner wall of the body, and a longitudinal axis extending substantially centrally through the opening. The distal portion includes an annular ring having a top surface and a ridge disposed opposite the top surface, the ridge extending substantially perpendicular to the longitudinal axis. The distal. The adapter also includes a seal configured to form a substantially fluid-tight seal with a surface of a fitting removably attachable to the adapter.

Abstract: A combined page holder and book support is disclosed herein having a shaped base formed with a pair of cut-outs along a selected end of the base and an elongated slot along the central longitudinal axis opening at the other end of the base. A pair of tab members are pivotally carried on the selected end of the base and rotate in and out of the respective cut-outs. A U-shaped support member is pivotally carried at the sides of the base and constitute a back for supporting an open book while the tab members constitute a pair separator. A brace is pivotally carried on the base and rotates into and out of the elongated slot. The brace detachably engages with the U-shaped member so as to support in an angular relationship to the base.