Click to expand Tap to zoom System Sensor | B501-IV Detector Base Ivory Flangeless 4 Inch SKU SS-F1D2-8915 Save Liquid error (snippets/product-badge line 32): Computation results in '-Infinity'% $27.99 | / Availability: Only 21 left! 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart