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IRECO's AAR-approved air-hose support (part number 20406) features a sliding thimble to protect the cable from the sharp edges of the air-hose support hole on the coupler, and a fixed thimble at the gladhand end to protect the cable from the sharp edges of the gladhand air-hose support hole. The sliding thimble allows for adjustment of the air-hose support as the thimble slides freely on the cable. The thimbles will not deform or bind on the cable during normal car uncoupling procedures. The increased protection of the sliding thimble will extend this product's life, says the company.