The Betts WD406ALVB is a 4-inch manually operated TTMA metering/locking Wet-R-Dri butterfly valve featuring a lightweight aluminum body and FKM-B Viton disc seal. This quarter-turn in-line stop valve includes an 8-position metering locking handle that holds the disc in the desired position for precise flow control. The valve handles liquid, gaseous, and dry products with a maximum working pressure of 75 psi and operates in temperatures from 9F to 400F. The bolt pattern matches TTMA piping flange dimensions for easy installation, and the valve can be mounted in any position with standard right-hand operation opening counterclockwise.