The Double Blast sits at the bottom of your sink, and is connected to your faucet with a braided, high-pressure hose. This eliminates the stress caused by faucet-mounted bottle washers. As with the regular Blast bottle washer, water hammer is not a problem with this product. Best of all, you can wash two bottles at once with this washer, slashing time off your bottling. Includes a nozzle specifically designed to clean carboys. This will probably require a faucet adapter for connecting to kitchen sinks.