Perma-Cast Water Bond PBSK20 2" mpt plug. Bronze grounding lug for pool skimmers and standard 2" threaded fittings or 2" threaded return fitting. Helps to prevent galvanic corrosion and electrolytic corrosion in pools. , Mfg #: PB-SK-20, 2008 NEC Electrical Code Section 680.26C requires a intentional water bond in all pools, spas and fountains, Use to shunt stray voltage in pool water to ground. Helps prevent electrolysis and galvanic corrosion in all pools. A must for use in pools with salt generation systems. Screws into a 2" female thread fitting in the plumbing lines. All pools should also use a Zinc Sacrificial Anode in the pool water.

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