Features:
Replaces original Cox glow head
ncludes head and glow plug
Uses "med-long" plug or "long" with extra spacer (included)
RPM range from 4,500 to 15,000
 
Head gasket is not included 
Cox glow heads require 1.5 volts to light up
The supplied glow plug is "long". Please use both spacers

Application:
Most Cox .049 Reed valve engines

Not well-suited for:
Tee Dee
Medallion
Venom
Killer Bee