The Signal Source has the industry's most competitive and extensive line of unique audible and visual signals specifically configured and listed for use with fire alarm and suppression supervised control panels and power boosters.

UA Local Union 669 Road Sprinkler Fitters, AFL-CIO, is dedicated to the education and training of its members. We strive to stay abreast of the continual evolution of fire sprinkler systems. Local Union 669 will furnish our contractors with journeymen and