Features:
For use with a regular (1/4") glow plug
Designed for medium length plugs (OS #8 or similar)
Additional spacer required for long plugs (included)
Brand new  Current Production item
 
Head gasket is not included
May reduce RPM by about 500 to 1000 on some engines

Application:
All Cox .049 reed valve engines
All Cox .051 reed valve engines
Stels .049
VA MKI .049
VA MKII .049
AME Aero .049 
Norvel .049 engines
Norvel .061 engines
AP Wasp .061 engines