I was hoping to get some help in finding Plastic End Caps for Standard Grease Gun Couplings. I have checked with several molding companies and found fitting caps of all makes & colors. I have seen several tethered type black plastic caps on grease guns before & would like to obtain some more to reduce cotamination while guns are not in use. If you have any information on where I might purchase something please let me know. I appreciate your efforts.