The QUICK TEEJET TP, XR, DG, TT, TTJ60, AIXR 114441A-6-CELR QUICK CAP WITH GASKET SEAT - YELLOW caps are designed with grooves that fit locating lugs on the nozzle body. When snapped into place the slotted cap insures the tips are properly aligned. Built of acetal for good strength and chemical resistance. Maximum operating pressure of 300 PSI.