RECT.AMP FOR R4150 3 SEC F.R.

Flame Amplifier, Infrared ( Red ), 2-4 Second Flame Failure Response Time, Used with Q518, Q519 and W688A Series

Flame Safeguard Amplifier, 2-4 Second Flame Failure Response Time, No Self Checking, Gas, Oil, Coal use Ultraviolet ( Minipeeper ) C7027 or C7035 Flame Sensor, Color: Purple, Use with Primary Safety Control Q518, Q519 or W688A Series