This is the O.S. #A3 glow plug which is similar to the #8 plug only more economical. This is a medium heat range two-stroke glow plug for all engine applications. Note that O.S. engine plugs are SHORT body plugs and should only be used in engines that require a short body plug. Features: Medium heat range plug for most model engine applications. Works well in any engine from .10-size to a BGX. Thick, solid platinum coil resists meltdowns and premature failure. Coil holds sufficient heat for a smooth idle. Finest glow plug in the economy price range. No Idle Bar
