This is a female EC3 style plug to male T-Style Ultra plug adapter from ProTek R/C.
ProTek RC Tire Glue Bands (8) PTK-2028
$4.99
ProTek RC T-Style Ultra Plug to XT60 Plug Adapter (Male Ultra/Female XT60) PTK-5302
$4.99
ProTek RC EC3 Style to T-Style Ultra Plug Adapter (Female EC3/Male Ultra) PTK-5235
$4.19
Only 1 left in stock
