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ASF-Keystone's GR series 10-, 15-, and 18-inch end-of-car cushion devices are available for replacement of existing cushion units as well as new car construction. These units feature an integral coupler yoke for use with all coupler types. The units are designed to replace existing cushion unit types with little or no car modifications. These devices are AAR-approved under the strict requirements of M-921B (100k preload) or M-921D (50k preload). All ASF-Keystone units are shipped from the factory precharged with nitrogen gas and ASF-Keystone's patented Unit Condition Indicator (U.C.I.).