The pressure relief kit of AG Fire Sprinkler is specially designed for alarm valve installations that are installed at places where could be excessive ambient temperatures. The high temperatures increase the volume of the water and the piping components, what can increase consistently the water pressure. This Pressure Relief Kit will relieve any excess pressure above 175 psi downstream the valve connecting the relief kit to the 3 way valve of the upper side of the by-pass trim with the main drainage.