Davies “TKS-FLUID” meets the rigid DTD 406-B British specification for wing, tail and propeller de-icing systems. “TKS-FLUID” is used in Raytheon aircraft, Hawker, Sidley, Dehaviland, Cirrus Design’s SR-22, (and others) with the TKS de-icing system. Special holding tanks in the plane store the fluid, which is pumped to leading wing edges, etc., when needed, to melt away ice.