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Part-turn cast iron worm gearbox suitable for use with fire protection (i.e. sprinkler) systems, includes limit switches to be incorporated into a supervisory electrical circuit. Designed and tested specifically to meet UL1091 specification and FM1112 approval. Torque range up to 1,000 Nm (737 lbf.ft). 5 sizes. Ratios from 40:1 to 60:1.