VIEGA ZŁ.MUFA 15x3/4" GW 642143 Steel fitting, 15×3/4" female thread

VIEGA ZŁ.MUFA 15x3/4" GW 642143 is a steel coupling that provides a transition between 15 mm metric pipework and a 3/4" female (Rp) threaded fitting. Manufactured in galvanised non-alloyed steel and fitted with an EPDM sealing element in a polygonal housing, this model is designed for plumbing and heating systems where a durable, threaded connection is required. The fitting incorporates VIEGA's press connection concept and is intended for use with water and heating media in systems that accept press and threaded transitions.

Advantages

The coupling combines a press-compatible end and a Rp female thread in one component, reducing the need for separate adapters. Galvanised non-alloyed steel construction offers mechanical robustness and resistance to typical installation stresses. The integrated EPDM sealing element provides a reliable seal at the threaded connection without additional sealing materials, and the polygon design assists secure tightening and alignment during installation.

Suitable for

• Plumbing systems connecting 15 mm metric pipes to 3/4" threaded components
• Domestic and commercial heating installations where press-to-thread transitions are required
• Water supply lines compatible with galvanised steel components

When it may not be suitable

This fitting is intended for use with water and typical heating media; it is not specified for aggressive chemical fluids or gases. It may not be appropriate for applications that require stainless steel or non-galvanised materials for corrosion resistance in highly corrosive environments. If the system standard mandates a different thread type or special sealing materials, this product may not meet those requirements.

Key specifications

• Connection types: 15 mm press-compatible end and 3/4" female (Rp) thread
• Material: galvanised non-alloyed steel
• Sealing: EPDM sealing element in polygon housing
• Model: 1112
• Designed for: water and heating system installations

How to use

Prepare the 15 mm pipe end according to the press connection manufacturer's instructions, ensuring the pipe is cut square and deburred. Insert the pipe into the press-compatible end of the coupling and complete the press operation with the correct jaws and tooling. Screw the 3/4" female thread onto the corresponding male threaded component, making sure the EPDM seal seats properly. Tighten to the torque and installation practice appropriate for the system; do not overtighten to avoid damaging the sealing element or thread. Perform pressure testing of the completed installation following applicable regulations.

What to consider before purchase

• Verify compatibility of the 3/4" Rp thread with the mating male thread in your system
• Confirm that galvanised steel is acceptable for the installation environment and media
• Ensure you have the correct pressing tools and jaws for 15 mm press connections
• Check that EPDM is suitable for the system temperature range and fluid used

Usage recommendations

Use the coupling within the manufacturer's recommended pressure and temperature limits, follow standard installation and testing procedures, and inspect the EPDM sealing element before assembly to ensure a reliable threaded connection between metric pipework and imperial fittings.