VSP-964-03 VESDA

(The VSP-964 is now obsolete the manufactures have brought out a replacement, but this will only be compatible on serial numbers that are GA3, if the serial number is a GA2 then you need to replace the full new unit. If its GA3 you should be ordering the 03 variant (VSP-964-03))
VESDA-E DET CHAMBER MK3