Brass transition coupling TECE 20 mm x 3/4" (model 705004) for plumbing connections

TECE brass transition coupling 20 mm x 3/4" (model 705004) is a compact plumbing fitting designed to join 20 mm pipe systems with 3/4" threaded fixtures. Manufactured from brass to provide corrosion resistance and mechanical strength, this coupling serves as a reliable interface between plastic or metal pipes and threaded valves, taps or radiators. The fitting is suited for potable water and heating installations where a secure threaded-to-pipe transition is required.

Advantages

The brass construction ensures long-term resistance to corrosion and wear while maintaining mechanical stability under typical domestic water and heating system pressures. The coupling provides a straightforward threaded connection to 3/4" fixtures and a smooth 20 mm pipe interface for a tight fit. Its compact form factor simplifies installation in confined spaces and reduces the need for additional adapters when converting between pipe and threaded connections.

Suitable for

• Connecting 20 mm pipe runs to 3/4" threaded valves and taps
• Linking heating radiators or convectors with threaded inlets
• Repair or retrofit work in potable water distribution systems
• Domestic and light commercial plumbing installations

Key specifications

• Material: brass for corrosion resistance and mechanical durability
• Pipe end size: 20 mm
• Threaded end size: 3/4" (female/male as required by installation)
• Intended media: potable water and heating fluids
• Typical applications: threaded-to-pipe transitions in plumbing and heating

How to use

Prepare the 20 mm pipe by cutting squarely and deburring the end to ensure proper seating. Fit the pipe into the coupling following any manufacturer guidance for push-fit, compression, or soldering methods if applicable; then tighten the 3/4" threaded connection to the mating fixture using an appropriate wrench, taking care not to overtighten and damage threads. Verify alignment and, if required, perform a pressure test to confirm leak-free installation before putting the system into regular use.

Usage recommendations

Use compatible sealing materials for threaded joints where necessary and follow local plumbing codes for potable water and heating installations. When working with mixed materials, ensure galvanic compatibility and consider applying recommended assembly torques to avoid deformation of the fitting.