The VTA Gear Pump Type 0.6 – Shaft Key is a precision steel shaft key used to lock the drive cog or coupling to the gear pump shaft on VTA wiped-film distillation systems, transmitting torque without slippage. This small but critical component must be in good condition to maintain accurate gear pump speed and prevent drive train backlash. An OEM replacement part for VTA VKL and VKS series gear pump assemblies. Sold individually.