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Waterway Four Union Assembly One And A Half Inch MPT To One And A Half Inch Slip stain free making Stay Puft a standoutWaterway Four Union Assembly 1 1 2" MPT to 1 1 2" Slip Intro Waterways Four Union Assembly is a 1 1 2 inch MPT to 1 1 2 inch slip connector designed for pool and spa plumbing. Built to performance standards common in residential and commercial systems, this four union design enables quick service without cutting pipes. Constructed from durable PVC, it resists pool chemicals and UV exposure, delivering reliable performance in harsh wet environments.