OS Glow Plug - #6 (A3) - Standard Thread - 0% to 7% Nitro - (OS-6)

1 piece. Short Reach. heat range - Hot. For use with fuels containing 0% to 7% Nitromethane.  A very good, durable, glow plug. Standard thread. Fits most 2 stroke glow engines from .07 upwards.

OS Glow Plug - #8 - Medium - Standard Thread - 7% to 12% Nitro

1 piece. Short reach. Heat range - Medium. For use with fuels containing 7% to 12% Nitromethane.  A good, durable, glow plug. Standard thread. Fits most 2 stroke glow engines from .07 upwards.

OS Glow Plug - Medium - (R5) - Standard Thread - 7% to 15% Nitro

1 piece. Short Reach. Heat range - Medium. For use with fuels containing 7% to 15% Nitromethane.  A very good, durable, glow plug. Good for applications requiring higher RPM. May be more resistant to vibration. Standard thread. Fits most...

OS Glow Plug - LC3 - Long Reach - 0% to 7% Nitro - (OS-LC3)

1 piece. Long Reach. Approx 1.5 threads longer giving better compression and fuel burn in some engines. Check for piston clearance before use. Heat range - Hot. For use with fuels containing 0% to 7% Nitromethane.  A very good, durable,...

OS Glow Plug - LC4 - Long Reach - 7% to 15% Nitro - (OS-LC4)

1 piece. Long Reach. Approx 1.5 threads longer giving better compression and fuel burn in some engines. Check for piston clearance before use. Heat range - Medium. For use with fuels containing 7% to approximately 12% to 15%...