Sink siphon and flange set Pupa LD0515 3 1/2" (3.5 in) double sink connection

Pupa LD0515 3 1/2" double sink siphon and flange set is designed for double-bowl kitchen sinks with standard 3.5-inch waste openings. The set includes a siphon body and matching flanges to connect two sink outlets to a single waste line, providing a sealed junction that prevents odours while directing wastewater to the drainage system. It is intended for household kitchens and utility areas, suitable for both new installations and replacement of existing drainage fittings.

Advantages

The set provides a compact, integrated solution for two-bowl sinks, combining two inlet flanges with a common siphon to simplify installation and reduce the number of separate fittings required. Constructed from corrosion-resistant materials, it offers reliable wastewater flow and a water seal to limit sewer gases. The standardized 3.5-inch connection ensures compatibility with common sink waste openings and existing drainpipe systems used in residential settings.

Suitable for

• Double-bowl kitchen sinks with 3.5-inch waste openings
• Replacement of worn or damaged sink siphons and flanges
• Domestic kitchen and utility room drainage installations
• Plumbing projects requiring a combined siphon for two outlets

Key specifications

• Connection size: 3 1/2" (3.5 in) standard sink waste
• Configuration: double inlet (two sink outlets to one siphon)
• Included components: siphon body and two flanges for sink outlets
• Function: wastewater drainage and odour trap (water seal)
• Intended use: household kitchen and utility area drainage

How to use

Install the flanges into the sink waste openings and secure them according to the sink manufacturer’s guidance, ensuring a proper seal between the sink and flange. Assemble the siphon body beneath the sink, connecting both inlet arms to the respective flanges and attaching the outlet to the existing drainpipe. Tighten all connections to avoid leaks and verify that the water seal is maintained by running water through both basins. If required, adjust connection lengths or use appropriate couplings to match the installation geometry.

Usage recommendations

For reliable performance, ensure all sealing surfaces are clean and use suitable plumber’s putty or gaskets where recommended. Check local plumbing codes for venting and trap requirements. Periodically inspect the siphon for accumulation of debris and clean as needed to maintain proper drainage and prevent odours.