The Red Head Brass HY-D turns any fire hydrant into an instant mass decon shower. It is the quickest and easiest way to provide mass decontamination for chlorine and other hazardous releases. Victims are decontaminated without massing around first responders who are not properly safeguarded in protective hazmat suits. No need for new structures or plumbing - use the infrastructure already in place.
NH or NST = (National Hose Thread) or (National Standard Thread) - Both Are The Same Thread