Reduction fitting Alkotest R3225, external reducer 32→25 mm (PP)

Alkotest R3225 is an external reduction fitting designed to join pipe systems by reducing an outer diameter from 32 mm to 25 mm. Manufactured from polypropylene (PP), this external reducer provides a mechanically stable transition between pipes or fittings with different outer diameters. Its geometry and material make it suitable for plumbing, irrigation and water distribution assemblies where a reliable, corrosion-resistant connection is required.

Advantages

The polypropylene construction ensures chemical resistance and low weight while maintaining dimensional stability. As an external reducer, it enables straightforward connection of mismatched PE/PP pipes or fittings without the need for adhesives or complex adaptors. The fitting offers a compact footprint and simplifies installation in confined spaces, reducing the number of custom components needed in a system.

Suitable for

• Domestic and commercial plumbing repairs and extensions
• Irrigation systems and garden water supply
• Water distribution lines and cold water installations
• Joining PE/PP pipes or fittings with 32 mm and 25 mm outer diameters

Key specifications

• Material: polypropylene (PP)
• Type: external reduction fitting (external reducer)
• From outer diameter: 32 mm
• To outer diameter: 25 mm
• Application: plumbing, irrigation, water distribution

How to use

Prepare the pipe ends by cutting them square and removing any burrs or debris. Slide the external reducer over the larger-diameter pipe so the smaller end aligns with the smaller pipe or fitting. Ensure proper insertion depth and check for snug mechanical fit. Depending on the assembly method used in the system, secure the joint according to standard practice for PP/PE connections (mechanical clamps, compression fittings or compatible welding methods where applicable). Verify alignment and test the connection under pressure before putting the system into regular operation.

Usage recommendations

Use the fitting within the temperature and pressure ranges recommended for polypropylene components. Avoid exposure to aggressive solvents and open flames. For permanent, pressure-tight installations, follow industry-standard joining procedures for PP/PE materials and, if necessary, consult system design guidelines or a qualified installer to select the appropriate retaining or sealing method.