ROMA XR501 Extended Range Ductile Iron Coupling

ROMA XR501 Extended Range Ductile Iron Coupling (8" x 7" configuration) is a field-installable ductile iron center-ring and end-ring coupling that flexibly joins pipes of widely different diameters. It covers 4" through 12" nominal sizes and is compatible with steel, cast iron, asbestos cement, plastic, and other pipe materials, making it a versatile solution for cross‑material transitions in piping systems. The center rings and end rings are cast from ductile iron and meet or exceed ASTM A536 (Grade 65-45-12), and the assembly uses 5/8" UNC trackhead bolts with heavy hex nuts; interchangeable gaskets accommodate variations in material and diameter, with gasket options commonly listed to fit the XR501 configuration. This product is manufactured in the USA and is designed for IPS through class 200 A/C pipe, with shop-coated finishes available on select listings. The XR501 provides a reliable, clamp-on solution for repair or transition tasks where pipes of different diameters must be connected without replacing existing sections, reducing downtime and labor while preserving system integrity in water distribution and other piping networks.