7932 21 21 by Parker | Legris Adjustable Check Valve Exhaust | 1/2" Male/Female BSPP Thread | 91.5 m Length | Straight | Nickel-Plated Brass | Pack of 5Technical Characteristics: Compatible Fluids: Compressed air Working Pressure: 0 to 12 bar Working Temperature: 20C to +80C Cracking Pressure: M5x0. 8 G1 8 G1 4 > 1 to 0. 10 bar G3 8 > 1 to 0. 15 bar G1 2 > 1 to 0. 20 bar Advantages: Adjustment and locking of the non return valve cracking pressure with two 2 Allen keys prevents the settings from being accidentally changed Designed with locking nut to protect initial setting in the event of vibration