Models 31X and 41X explosion proof vibrating horns are constructed for safe use in hazardous environments. They are enclosed in heavy duty copper-free cast aluminum housings tapped for 3 /4 in conduit. Federal signal models 31X and 41X are corrosion-resistant vibrating horns with stainless steel diaphragms. Model 41X is available in 24 VDC. The model 31X is available in 120 VAC and 240 VAC and features an internal volume control. A 5 min duty cycle applies to both models.