If your refering to the safety valve(burst valve) or whatever its called, its kind of an essential safety feature. You can however tale it off and put it where the grub screw of the same size is at the rear of the marker. Then with the hole thats left you can put your lpr in there and your ugly valve has gone! Albeit just to the back of the marker. Otherwise just leave it where it is and have your lpr coming out of the end cap as normal.