6″ X 4″ DI (BS1387) GROOVED RED COUPLING

The 6″ x 4″ Ductile Iron (DI) Grooved Reducing Coupling is a specialized mechanical fitting designed to create a direct, streamlined transition between a 6-inch (DN150) and a 4-inch (DN100) pipe run. This component effectively replaces the need for a separate concentric reducer and two individual couplings, significantly reducing installation time and material costs.
Specifically manufactured to be compatible with BS1387 (EN 10255) steel pipes, it is constructed from high-strength Ductile Iron (ASTM A536 Grade 65-45-12). The coupling features a “Red” epoxy-coated finish for superior corrosion resistance and high visibility in fire protection and HVAC systems. It includes a specialized reducing gasket with a center rib that ensures proper pipe alignment and prevents the 4″ pipe from telescoping into the 6″ pipe during high-pressure operation.

Technical Specification

Nominal Size: 6″ x 4″ (DN150 x DN100)
Housing Material: Ductile Iron ASTM A536, Grade 65-45-12
Standard Compatibility: BS1387 / EN 10255 (Steel Pipe)
Pressure Rating: 300 – 500 PSI (Depending on pipe schedule)
Gasket Type: EPDM (Grade E) – Suitable for Water/HVAC
Temperature Range: -34°C to +110°C (-30°F to +230°F)
Finish: Red Painted (Epoxy Powder)