Dual-purpose valve for a catheter
FIG. 1 is a perspective view of a dual-purpose valve for a catheter showing my new design; 
     FIG. 2 is a left end view thereof; 
     FIG. 3 is a right end view thereof; 
     FIG. 4 is a top plan view thereof; 
     FIG. 5 is a bottom plan view thereof; 
     FIG. 6 is a front view thereof; and 
     FIG. 7 is a rear view thereof.