This is a female EC3 style plug to male T-Style Ultra plug adapter from ProTek R/C.
This product was added to our catalog on October 9, 2008
Thursday, Sep 3 2015 (about 5 years ago)
ProTek RC EC3 Style to T-Style Ultra Plug Adapter (Female EC3/Male Ultra)
Works great! Better quality than the Amazon and Ebay off brands that the solder falls off when it gets hot.