Product Description Detailed Specs Downloads Reviews/Questions Product Description PX4i PX6i, SLOTTED OPTICAL SENSOR HL PX Detailed Specs null null null null null null null null null null MFG Part Number 1-974006-020 Product Type Accessory Product Family PX4i, PX6i Downloads Warranties Warranties Reviews/Questions The Honeywell 1-974006-020 is also known as HON -1974006020 or 1974006020