Abstract: A knock-down barrier positioned and supported about the circumference of an area or pool for preventing admittance into the area or pool. The knock-down barrier includes a plurality of barrier members, each being of singular construction in a hollow, tubular, airtight manner. The barrier members are supported within support holes positioned proximate the circumference of the area. Each barrier member can be separately removed or positioned within the support holes. The support holes are located within support posts embedded within the ground proximate the area. When the knock-down barrier is not in use, a plug is provided for each support hole so that the support holes do not have to be circumnavigated in order to avoid tripping or falling over them.