Estes 302317 Standard to D Engine Adapter

• Digital altimeter for measuring model rocket flight altitude
• Records maximum altitude reached during flight
• Compact design fits easily into most payload sections
• Reusable device ideal for testing and performance tracking
• Great for STEM activities, clubs, and advanced rocketeers

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 3 adapters per pack Resuable Illustrated instructions included YOU WILL RECEIVE: 3 standard to D engine adapters. 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