PIPING DEVICE

PROBLEM TO BE SOLVED: To connect the piping of an additional water using apparatus optionally selected by a used so as to be fitted to the feeing and draining equipment capacity by providing a draining capacity display part for displaying the flowing capacity of draining on a piping joint. SOLUTION: A label 43 showing the flowing capacity of feeding and draining is stuck to the surface of a cover plate 31 for covering a piping joint unit 5. This label 43 has an upper limit flow rate indication showing the upper limit flow rate determined mainly on the basis of draining capacity, and also a heat resisting temperature display since there is the possibility of draining high- temperature hot water. The label 43 further has a feeding pressure indication, considering the breakage by the pressure rise by water hammer caused when the valve of a terminal apparatus to be connected for feeding is closed. Further, the label 43 also has a draining pressure indication since force feed draining is considerable when a draining passage is sealed by additional attachment of a drain pipe, or connection with a drain pipe not ensuring a hydraulic gradient.