The WTW D 3Sen Flow-Through Vessel holds up to three pH, ORP, dissolved-oxygen, or conductivity sensors (IDS or analog) in a sealed flow cell for stable, low-disturbance measurement of pumped samples — ideal for low-flow groundwater sampling where exposure to air must be minimized.

Includes a tube adapter for standard garden hose (19 mm / ¾″ inner diameter) and a clamp for mast mounting. Part number 903842.