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This extension adapter is designed for use with the Orion 2" Crayford-type telescope focuser (#13039). The adapter provides the extra height needed when the focuser is used with Orion 203mm f/4.9 and 254mm f/4.7 reflector telescope. The adapter is not required on Orion Dobsonian telescopes.
Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.