Pipe Coupling SiGMA-Li ZZ251 PP 25 mm (1")

SiGMA-Li ZZ251 PP 25 mm (1") is a polypropylene pipe coupling engineered to connect or extend 25 mm (1") plastic pipes. The coupling creates a mechanical joint suitable for water supply and general plumbing systems. Its compact design allows use in confined spaces and it is compatible with standard 25 mm piping made of polypropylene and other common plastic materials where socket-style couplings are applicable.

Advantages

The polypropylene construction provides chemical resistance, low weight and corrosion-free performance. The coupling delivers a straightforward mechanical connection without the need for adhesives or heat fusion when used with the correct installation method. Its compact dimensions simplify installation in tight areas and reduce the amount of exposed fitting. Designed for common plumbing applications, the coupling supports reliable water flow and long-term dimensional stability under normal operating conditions.

Suitable for

• Connecting two 25 mm (1") plastic pipes to extend a run
• Repairing a short section of damaged piping in domestic water systems
• Indoor and outdoor plumbing installations where PP fittings are specified
• General non-pressurized or low-pressure fluid conveyance in buildings

Key specifications

• Material: polypropylene (PP)
• Nominal pipe size: 25 mm (1")
• Type: straight coupling for inline joints
• Application: water supply and general plumbing
• Installation environment: indoor and outdoor use where PP is suitable

How to use

Ensure both pipe ends are cut square, clean and free of burrs or debris. Verify pipe compatibility with polypropylene fittings. Insert each pipe end fully into the coupling following any alignment marks or insertion depth guidelines from the pipe manufacturer. For mechanical or compression variants, tighten per the fitting instructions until a secure seal is achieved; for socket fittings intended for adhesive or fusion, use the proper joining method specified for PP systems. After installation, inspect the joint and perform a pressure or leak test appropriate for the system before returning to service.

Usage recommendations

Use appropriate personal protective equipment during installation. Avoid exposing polypropylene fittings to solvents and high temperatures beyond the material’s rated limits. When used in pressurized systems, follow relevant plumbing codes and perform pressure testing to confirm joint integrity.