System Sensor WBB, Weatherproof Back Box AccessoryCondition:* New Surplus Stock, In OEM Packaging. As Pictured.Additional Notes:* Box: 4.33 (L) 1.55 (W) 4.33 (H)* Foam gasket: 0.125 thick, adheres to box top * Conduit opening: (2) 12 NPT, fully threaded with (2) 12 NPT plug, (1) 78 knockout plug * Rear mounting tabs with 0.25 Diameter Eyelets * Top mounting holes, #8-32 0.50 DP* System Sensor WBB is a weatherproof back box for use with: H12/24K, S1224MCK, P1224MCK, and P12015K series SpectrAlert wall horn, strobe and horn/strobe models SSM24 and SSV120 series alarm bellsSystem Sensor WBB