The Tenacore Holdings Inc Model TWSA1500 Vacuum Regulator is a set of four analog vacuum regulators designed for use in medical and laboratory settings. Manufactured in the United States, these regulators feature a blue color and are ideal for precision control of vacuum levels in various applications. With the trusted Tenacore Holdings Inc brand behind them, these vacuum regulators are reliable and accurate tools for maintaining controlled environments in research and medical settings. Not tested AS-IS No returns