WHILE SAMPLING CKD, EMPLOYEE OPENED THE VALVE AND NOTHING CAME OUT OF THE HOSE. HE TAPPED HOSE ON CONCRETE BLOCK AND STILL NOTHING CAME OUT. WITH THE VALVE OPEN HE TAPPED VALVE BODY WITH CHIPPING HAMMER THAT WAS THERE. GASKET IN THE CHICAGO FITTING AFTER THE VALVE BLEW OUT COVERING EMPLOYEE WITH DUST FROM THE WAIST UP.