Grid Coupling Parts & Kits Grid Coupling parts & kits for the Falk Steelflex couplings are comprised of shaft hubs, spacer assemblies, grid elements, covers, seals, gaskets and fastener kits. Available in the Following Types: Cover fastener sets Cover Grid Assemblies Covers Complete Gaskets kits Grids Hubs Seal Kit Spacer Assemblies Spacer Hub Flange Fastener Sets