173_58300000002379_ara_en_j.doc – 29.04.14
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2.21 Selection of the correct Lokring connection
One of the chief causes for leakages at Lokring connections are too
large Lokring connecters.
Table of the most popular Lokring connections
pipe diameter (mm)
from to
Lokring connection
1,80
1,90
1,80 mm
1,90
2,00
2,00 mm
3,90
4,10
4,00 mm
4,40
4,70
4,50 mm
4,75
5,10
5,00 mm
5,90
6,45
6,00 mm
6,90
7,10
7,00 mm
7,90
8,10
8,00 mm
9,40
9,70
9,53 mm
The specifications of the pipe diameter refer to the unpainted tube.
Maybe the nozzle of the Lokring connection has to be carefully
enlarged, if the connecter is smaller than the pipe diameter.
For identifying the correct pipe diameter, it must
always be measured.
2.22 Lokring connection - Conditions of the tubes
To ensure a leakproof Lokring connection, the pipe ends must be
metallically blank. Remove paint, zinc coating, rust as well as oil and
grease by rubbing with fine emery cloth in a circular motion.
