Heavy Duty 3 Cable Parallel Ground Connector for 1 1/2 Inch Pipe 250 MCM-2/0 AWG Made of high-copper-content alloy for grounding to 1/2" - 1" ground rods 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.