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This Micro Matic Beer Coupler brush works great! This is the version for the more common D and S systems found in the US as standard. Cleaning is as simple as unscrewing the supply hose from the coupler and removing the ball and plastic holder. Then slide the brush in with some soap and water and twist around to clean. It cleans the inside of the coupler and also the mating surfaces to the actual keg. Reconnect and run beer line cleaner through the system!