Blackmer® STX sliding vane pumps, which are part of the Stainless Line offer fast fluid off-loading - typical off-loading of a 6,000 gallon (22,700 liter) tanker can be unloaded as quickly as 24 minutes. The STX pumps are designed for loading and unloading corrosive and non-corrosive fluids including liquid sugars, solvents, latex paints and vegetable oils. These pumps feature an adjustable relief valve, versatile mounting bracket, weld flanges and are self-priming. The STX Series is designed to offer easy maintenance because the internal wear is limited almost completely to the sliding vanes, which can be replaced with ordinary hand tools. These pumps' non-metallic vanes self-compensate for wear and allow the STX Series pumps to run dry for short periods of time for self-priming and blowing lines clean, without pump damage. The STX-DEF pump is designed for use with DEF/AdBlue.