Emergency Signaling System Accessory Type Emergency Signaling System Color Silver/Black/Gray Compatible Grainger Part Number 415Z16 415Z15 415Z21 415Z14 415Z18 415Z20 415Z17 415Z19 Compatible Inlet Pipe Gender Female Compatible Inlet Pipe Size 1 1/4 in Compatible Inlet Pipe Thread Type NPT Compatible Mfr Part Number S19-324D1D S19-324D1DHT Compatible with Brand Bradley Compatible with Series Halo Current 3 A Depth 2 7/8 in Height 14 1/2 in Width 3 13/16 in