Features and Benefits:

• Reduces line pressure down to 30 PSIG (2 Bar)
• Meets O.S.H.A. requirements of special relief hole in nozzle which limits pressure to 30 PSIG (2 Bar) when dead ended and used on an air line of 150 PSIG (10.3 Bar) or less
• Connects only one time...mounts permanently between coupler and air hose
• Purges air line of water and contaminants before starting up air tools
• Durable aluminum construction, weighs only 2 oz
• Each unit has 1/4" female NPT thread at both ends for easy installation
• Maximum working pressure: 150 PSIG (10 Bar)
• Assemblies include one coupler and one plug

This in-line safety tip design, connects only one time, mounts permanent  between coupler and air hose.  It meets O.S.H.A. requirements of special relief hole in nozzle which limits pressure to 30 PSIG (2 Bar) when dead ended and used on an air line of 150 PSIG (10.3 Bar) or less.  It's made for the professional use!