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Conex Compression plumbing fittings

Conex Compression fittings are especially advantageous in retrofit plumbing schemes, where space is confined and/or the use of heat must be avoided. They are available in 6-108mm and are suitable for connecting tubes in accordance with EN 1057 and many other standards including ISO 274.

Conex unique ribbed capnuts are supplied in 15-28mm. Sizes 6-12 and 35-54mm are supplied with octagonal capnuts. Fittings in 66.7-108mm incorporate loose compression plates, where tightening is through six 3/8" BSW nuts and allthreads. PTFE tape is not required for the installation process.

Conex Compression fittings are available in duplex brass and/or dezincification resistant (DZR) brass or as dezincification immune gunmetal. Fittings are also available nickel-plated or chrome plated in accordance with EN 248.

Conex Compression fittings are suitable for connecting a wide range of tubes including copper tubes in accordance with EN 1057 and many other standards including ISO 274. Fittings are also compatible with connecting low carbon steel, stainless steel and many types of plastic pipe including crossed linked polyethylene (PE-X) and polybutylene (PB) with size compatible outside diameters.

Hydraulic working temperatures and pressures based on EN 1254-2 are shown below

Hydraulic working temperatures and pressures based on EN 1254-2 are shown below:
For Use WithTube Sizes (mm)Temps Not Exceeding (°C)Max Working Pressure (Bar)
Water Applications 6 - 15 0 - 95 25
16 - 28 16
35 - 54 13
67 - 108 10
LPG, Natural Gas 8 - 28 30 1
Compressed Air 8 - 28 30 7

Maximum Working Temperatures and Pressures

Tube Compatibility Table
Material Tube Specification Size > 6mm to 18mm 22mm 28 to 54mm    
Half Hard and Hard Copper EN1057-R250 (Half Hard) No of Turns 1 ¾    
Liner none none none    
EN1057-R290 (Hard) No of Turns 1 ¾ ½    
Liner None None None    
Soft Copper EN1057-R220 Size > 8mm 10mm 15mm 18mm 22mm
No of Turns 1
Liner: SC1 8 x 1.0 10 x 1.0 15 x 1.0 18 x 1.0 22 x 1.0
Stainless Steel EN10312 Series 1+2 (BS4127) Size > 6mm to 22mm 28mm 35mm to 54mm 67mm to 76.1mm  
No of Turns ¾ ½ ½* *  
Liner None None None *  
Flexible Polybutylene Size > 10mm 15mm 22mm 28mm  
No of Turns  
¤Liner 10 x 1.5/1.8 15 x 1.7/2.0 22 x 2.0//2.3 28 x 2.6/2.9  
Cross Linked Polyethylene(PE-X) Size > 10mm 15mm 22mm 28mm  
No of Turns  
¤Liner 10 x 1.5/1.8 15 x 1.5/1.8 22 x 2.0//2.3 28 x 2.6/2.9  
Medium Density Polyethylene (MDPE) Size > 20mm 25mm 32mm    
No of Turns    
Liner: PY 20 x 2.3/2.6 25 x 2.3/2.6 32 x 3.0/3.4    

PLEASE CONSULT OUR TECHNICAL DEPARTMENT WHEN USING OTHER MATERIALS
* Please refer to our Technical Department.
Liner to be specified by tube manufacturer.