THE CHAMBER IS CONNECTED TO VESSEL WITH CROSS FITTINGS AND FLANGED, THREADED OR WELDED ENDS. USUALLY, BETWEEN THE INSTRUMENT AND ITS CONNECTING ENDS, VALVES ARE FITTED TO CONSENT SHUT-OFF PIPING AND TO DISASSEMBLE THE LEVEL GAUGE WITHOUT EMPTYING THE VESSEL. DRAIN VALVES CAN ALSO BE FITTED TO CROSS FITTINGS DEVICE. TO AVOID LEAKAGE IN CASE OF GLASS BREAKAGE, SAFETY BALL-CHECK DEVICE CAN BE PROVIDED IN CROSS-FITTINGS OR SHUT-OFF VALVES.