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The ROMAC 201-03510351000 is a Series 501 cast iron transition coupling designed to connect pipes of differing materials or slight size variations in pressure and non-pressure piping systems. This coupling provides a reliable mechanical joint that accommodates standard outside-diameter differences between pipe types, making it a go-to solution for water and wastewater distribution repairs and installations. Licensed plumbers and water system contractors install this type of fitting when transitioning between pipe materials such as cast iron, ductile iron, PVC, or concrete in underground or above-grade applications.
This fitting is suited for municipal water distribution, sewer systems, and industrial piping applications where a 3-inch nominal pipe size connection spanning 10 inches of coupling length is required. The Series 501 design is commonly used in both new construction and retrofit work where pipe material transitions occur at service connections, mains repairs, or lateral installations.
Designed as an OEM-style transition coupling for 3-inch nominal diameter piping systems where material transitions are required in water, wastewater, or industrial distribution applications.
Installation should be performed by a licensed plumber or certified water system contractor in accordance with local plumbing codes and applicable AWWA standards. Shut off and depressurize the line before beginning work and confirm pipe outside diameters are within the coupling range prior to assembly. Bolts should be tightened evenly in a cross pattern to ensure uniform gasket compression. Follow the manufacturer torque sequence guidelines provided with the fitting.
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