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【Universal Size】Inner diameter 40mm/1.6 inches, fits nominal 1-1/4 inch pipes. This flexible rubber coupling is designed to connect pipes of the same outer diameter. 【Smooth Bore】The smooth inner surface of the rubber coupling prevents debris buildup and bacterial growth. This design maintains optimal flow rate in drainage systems and reduces unpleasant odors caused by waste retention. 【Repair Backup】The package includes 2 PVC pipe couplings. Repair cracked sewage pipes, connect new exhaust fans, or keep one as a spare for emergency plumbing issues. 【Tool‑Free】The flexible coupling easily slips over pipe ends by hand, while the pre‑installed stainless steel clamps tighten with just a screwdriver or nut driver. 【Quality Material】Made of EPDM rubber that resists ozone, UV, and extreme temperatures, this coupling maintains a watertight seal from -30°C to 120°C. The 304 stainless steel clamps provide corrosion‑resistant fastening for a secure, leak‑proof connection for decades.