Safety?
Always use caution when working with pressure. Water pressure frequently has close to one hundred pounds psi and can be very dangerous. Always give a plug room to blow out of a line. Do not stand in front of a plug, stand to one side. In pumps use a wrench when removing a plug and watch for check valves in front of plugs. Inflatables can also be dangerous. Remember give the plug room and space to blow free. Release pressure prior to removal of plugs.