The CSR 425 ball valve retractable holder’s modular design accepts any 425 mm long, 12 mm diameter, PG 13.5 threaded pH sensor. The holder’s ball valve is intended for installations through a 1″ process connection.   Unlike other ball valve style holders, the CSR 425 is ideal for quick-disconnect sensors. You will never have to pull the cable completely through the fitting when changing out the sensor.   The CSR 425, ball valve retractable holder, allows for easy replacement of old sensor technology as well as an option for applications requiring insertion depths of up to 11.5 inches. The CSR 425 can be constructed from several materials allowing for use in a wide variety of applications.   The CSR 425 is the ball valve retractable holder of choice when field installation requires a double block and bleed configuration.