A drain cleaner is a chemical product that unblocks sewer pipes or clogged wastewater drains. He posits that tapping unblocks or balances the flow of qi. It also unblocks Simon's account and restores his control of Tillman. On obtaining this message, RPL owner unblocks the RPL port. Quive-Smith unblocks the entrance, but waits to shoot him as he crawls out.