Lever action jumper assembly provides both old style and new style connectors thus eliminating costly change-over from brass connector to new, all-rubber connector. Unique molded assembly free of maintenance. Connectors are water and dust-tight when engaged. Engages mechanically eliminates couplers seizing together. Manganese bronze connector provides immediate connect. Two O-ring seals in manganese bronze casting. All rubber connector will not go out of round. Flexible ground pin. Silver-plated contact pins. Six-fingered female contact pin for positive contact with male pin.