Covers fit taper bushed, QD and stock and finished bore couplings. Covers allow excellent lubrication and their use is recommended to obtain maximum coupling life. Covers are of aluminum and are made in halves for easy installation. Synthetic rubber oil seals, which contact the coupling hubs, retain the lubricant and prevent the entry of dirt. Covers are fitted with gaskets between the halves. Martin Coupling Cover Seal, 8 in Outside Dia, Rubber