External Reduction Adapter Alkotest R2520, size 25/20 mm, model R2520

Alkotest R2520 is an external reduction adapter designed to join or downsize cylindrical fittings from 25 mm to 20 mm. Made from polypropylene, this PP.RED-25/20 style adapter provides a simple mechanical transition between different diameters and is intended for applications where a compact, corrosion-resistant connector is required. The adapter is suitable for installation on pipes, tubing or compatible fittings in systems that carry liquids or non-aggressive gases and where a reliable 25→20 mm reduction is needed.

Advantages

The external reduction adapter offers a compact footprint and straightforward push-fit or slip-fit installation depending on system design. Constructed from polypropylene, the adapter exhibits chemical resistance to many common fluids, low weight for easier handling, and dimensional stability over typical temperature ranges for non-pressurized or low-pressure systems. Its smooth bore and precise diameter transition minimize flow disturbances at the connection point.

Suitable for

• Plumbing repairs and small bore pipe connections
• Instrumentation and laboratory tubing transitions
• Equipment maintenance and retrofitting of fluid lines
• Low-pressure liquid distribution and drainage systems

Key specifications

• Material: polypropylene (PP)
• Type: external reduction adapter
• Connection sizes: 25 mm to 20 mm
• Design: straight, single-step diameter reduction
• Typical use: mechanical coupling for tubes and pipes

How to use

Ensure both mating pipe ends are clean, free of debris and cut squarely before assembly. Insert the 25 mm pipe end onto the larger side of the adapter and the 20 mm pipe onto the smaller side, applying a steady push until fully seated. For systems that require sealed joints, add appropriate sealing methods such as adhesive, heat fusion (if compatible), or external clamps according to system requirements and the material compatibility of polypropylene. Verify alignment and secure fittings to prevent movement when the system is pressurized or in use.

Usage recommendations

Use the adapter in applications within the material's chemical and temperature limits; avoid exposure to strong oxidizers or solvents that may degrade polypropylene. For pressurized systems, confirm pressure ratings and consider additional fastening or sealing methods. Inspect connections periodically for signs of wear, cracking, or leakage and replace the adapter if any damage is observed.