This original old Stock Cannon U-10 Plug, is the original (Female) 3 conductor connector for the Collins ART-13. It is the end that goes to the Dynamometer from the ART-13 U-11 Plug. This one is a 90 degree plug as I do not have the straight ones.I also have the U-7 female plug for the transmitter and the U-9 Male plug for the Dynamotor or Power supply, as well as the U-11, U-8 and U-6 in other listings.These connectors are near impossible to find till now! This Rare and hard to find connector is in excellent condition. There are few to be found so do not let this one get away!