The Estes Standard to D size Engine Adapter allows you to use a standard Estes engine in place of a C11 or D12 Estes engine. Rockets weighing up to 4 ounces that would normally fly on C11 and D12 engines can be now be flown on B and C engines. Simply Insert a standard engine into the adapter, and insert the adapter into a rocket. Made of high heat ABS plastic, the engine adapters come three to a pack and can be used over and over again!
Please note: These adapters were designed for Estes rockets with metal engine hooks using Estes engines. They may not work with other brands.
