Socket of pipe coupling for charging hydrogen

FIG. 1 is a front elevational view of a socket of pipe coupling for charging hydrogen showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view thereof when seen from the top and right side of the back.