The Fittings | Rotary Transmission Shaft (VKL) is the precision stainless steel shaft that transmits rotational drive from the motor assembly to the internal wiper basket on VKL series VTA wiped-film distillation systems. It passes through the stuffing box vacuum seal at the top of the evaporator body. Replace when shaft runout, seal leakage, or surface corrosion is detected during preventative maintenance. An OEM VTA replacement component for VKL 70-S, VKL 75, and VKL 85 distillation systems.