MetraFire has been supplying piping specialty products since 1958. With the introduction of the UL listed and FM Approved Fir ... e Loop Seismic Expansion Joint, MetraFire has brought its expertise in seismic expansion joints to the fire sprinkler industry. The introduction and rapid industry acceptance of the Fire Loop for fire sprinkler systems, plus its compliance with NFPA 13 guidelines, has made it the seismic expansion joint of choice. For inquires and questions, please contact sales@metrafire.com or call us at 312-738-3800 and ask for the Fire Protection Division. read more