6 Place Top Plate Only, Bill-Board. Consist of a polypropylene plate with the O-rings installed to hold the glass vessels firmly in place. Plates have four holes that correspond to the pins in either the drain trays or collection racks. (Please Note: Plates Purchased Separately are NOT Supplied with Reaction Vessels.) Part of the CG-1869-01 Bill-Board set. The Bill-Board set has been designed to simplify and expedite multiple, solid-phase syntheses. Up to 6 reactions can be conducted simultaneously in fritted glass reaction vessels. The Bill-Board equipment keeps the solid-phase reactions organized in a grid. Also, the system simplifies the essential steps of solid-phase synthesis which involve repeated cycles of reactions and washings, followed by a final cleavage, product collection and solvent evaporation. The Bill-Boards can also be used for any procedures that require multiple filtrations (.ie. simultaneous silica gel chromatography).