Abstract: A waterproof splice connector for pairs of electrical leads having a high tensile pullout resistance, suitable for use in splicing blasting cap leads, in which the each of the electrical leads are received in opposite ends of a respective one of a pair of clip connected tubular bodies, through holes formed in sealing end plugs. A tubular metal insert is disposed in each body and has oppositely directed roughly conical lead end receptacles, each formed with wire lead retaining barbs. The conical receptacles overlap such that the full length of the insert is utilized to grip a respective electrical lead. The sealing plugs are formed of a resilient material compressed into converging transition sections of the connector body to compress the plug ends and thereby close off the openings and sealingly grip a respective electrical lead. The interior of the connector is filled with an anti-oxidant sealant enhancing the water proofing of the connector interior.