fire hydrant, fireplug, or firecock on a street side. it is a connection point by which firefighters can tap into a water supply

red fire hydrant emergency water protection equipment pressure street valve firefighter fireman hose extinguish rescue extinguisher extinguishing fighting warning firefighting fireplug response urban planning prevention firefighters apparatus infrastructure suppression maintenance system tools truck reel sign marker municipal exigent aid kit services fixture furniture essential utility high engine firecock side connection point tap supply supply component active