A compact hub-to-hub reducing coupling for seamless size transitions in ABS DWV runs. Solvent-weld to Schedule-40 IPS ABS for a rigid, leak-resistant join; the fitting family conforms to ASTM D2661 and CSA B181.1 and is commonly cUPC-listed for code acceptance across Canada. DWV only—follow water (hydrostatic) test methods, not compressed-air tests.