Heavy Duty 2 Cable Parallel Ground Connector for 1 1/4in. Pipe Made of high-copper-content alloy for grounding two parallel copper cables for ground pipes from 1" - 3" in parallel or 90 and ground pipes from 1/4" - 3 1/2" in parallel or 90 degree position. Suitable for direct burial in earth and concrete. Nuts and lockwashers are silicon bronze