Reaction Vessel Filters for RTF Version Reaction Vessels This is a Reaction Vessel replacement and⁄or accesory for the 431A⁄433A peptide synthesis instruments. For Research Use Only. Not for use in diagnostics procedures. Platform: 433A Peptide Synthesizer Product Size: 30 each Accessory Type: Filter Shipping Condition: Room Temperature Regulatory Statement: For Research Use Only. Not for use in diagnostic procedures. Store at room temperature.