Orion™ AQUAfast 24mm Round Vials for Colorimeters and Spectrophotometers. Catalog number: AC2V24. Technical Support Customer Service. Use Aijiren Tech™ Orion™ AQUAfast 24mm Round Vials with a variety of Orion™ colorimeters and spectrophotometers. The Orion™ AQUAfast 24mm Round Vials can be used with Orion™ AQUAfast colorimetric powder pack, tablet and liquid reagents to measure a variety of common water and wastewater parameters.