EMPLOYEE WAS TRYING TO UNCHOKE THE ZINC 1ST CLEANER LAUNDRY DISCHARGE LINE. A WATER HOSE WAS IN THE CHOKED-UP LINE, THE EMPLOYEE WENT TO PULL THE WATER HOSE OUT OF THE LINE. AS EE WAS PULLING THE WATER HOSE OUT OF THE PIPE, THE PIPE DISLODGED OUT OF THE PIPE CONNECTOR HUGGER AND FELL HITTING THEIR LEFT ARM AND LEFT HAND.