General Specification

Flowflex Solder Ring Fittings, manufactured in both Copper and Bronze, are a fast, reliable and economic method of joining BS EN 1057 copper tube.

Solder Ring Fittings connect to copper tube through the process of capillary action with solder forming an easy, effective joint between the fitting and the tube. They are lightweight for easy handling and lend themselves well to confined environments due to their compact sizing.


Flowflex operates a quality management system audited by the British Standards Institute for the manufacture and supply of fittings and components for use in all applications of the HVAC industry.

Flowflex reserve the right to alter the product ranges and specifications associated with its products without prior notice

Working Conditions

Typical examples of soldering alloys Maximum temperature °C Maximum pressures for nominal diameters BAR
From 6mm up to 34mm Over 34mm up to 54mm
Tin/silver 95/5% 30 25 25
65 25 16
110 16 10
Tin/copper Cu 3% Max 0.4% min. Remainder Sn 30 25 25
65 25 16
110 16 10

For use in applications outside the scope of this table, the approval from us should be obtained. Please contact us in these cases.

Intermediate pressure ratings shall be obtained by interpolation

NOTE: Soldering alloys with lead and brazing alloys with cadmium are not permitted in installations for water for hu- man consumption

Electrical Continuity

Equipotential Bonding forms an important part of an installation, which ensures that all metalwork may be earthed or at least has the same potential to reduce the risk of equipment damage and personal injury. Isolated fittings or valves are not required to be bonded.

Flowflex Copper Fittings provide guaranteed electrical continuity when correctly assembled with EN1057 Copper Tube.

After all plumbing work has been completed, always ensure continuity checks are conducted by a qualified electrician in accordance with regulations (BS 7671).