ITEM NAME:5x Tube 1/4 Bulkhead Union Pneumatic Connector Fittings Air Vacuum Connect Description: Recommended Tubing Material: Polyurethane, Nylon, Polyethylene, Polypropylene. Universal for any type of pneumatic connections. Operating Pressure: 0-0.9Mpaï ¼Ë†0-9.2kgf/c㎠¡Ã¯ ¼â€° Maximum Pressure:1.32Mpaï ¼Ë†13.5kgf/c㎠¡Ã¯ ¼â€° Negative Pressure:-99.9-0Kpaï ¼Ë†-750-0mmHgï ¼â€° Operating Temperature: 0 - 60  °C / 32 to 140F Thread Sealant: Application:Air/Vacuum Size:Approx.1.18''X0.79''X0.79''/30mmX20mmX20mm Tube OD:6mm(1/4'') Material:Nickel Plated Brass Package Includes: 5 x Bulkhead Union.5 x Bulkhead Union. Universal for any type of pneumatic connections. Tube OD:6mm(1/4"). Negative Pressure:-99.9-0Kpaï ¼Ë†-750-0mmHgï ¼â€°. Material:Nickel Plated Brass. Maximum Pressure:1.32Mpaï ¼Ë†13.5kgf/c㎠¡Ã¯ ¼â€°.