Drain Tray Only, with 90 Degree Elbow, Bill-Board. Have a machined channel to insure total drainage to a supplied 90 threaded elbow. Trays have four Stainless Steel pins that correspond to the holes in the top plate assemblies. 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 (for potential combinatorial reaction sequences). 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 (i.e. simultaneous silica gel chromatography).