This is the Standard to D Engine Adapters by Estes.
Suitable for Ages 10 & Older with Adult Supervision for Those Under 12.
FEATURES:
Two simple steps transform a standard engine into a D size
Insert a standard engine into the adapter, and insert the adapter
into the rocket
3 adapters per pack
Resuable
Illustrated instructions included
YOU WILL RECEIVE:
3 standard to D engine adapters
COMMENTS:
Due to small parts that could cause a choking hazard please keep
away from children 3 years of age and younger
For your safety and enjoyment, always follow the NAR Model Rocketry
Safety Code while participating in any model rocketry activities