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This drawing demonstrates the right way to use compression fitting: the first step
is to pin on the fitting’s nut on the tube.
Than insert the tube into the fitting (in our case the elbow).
Finely, use the nut to lock the tube into place. This assembly will be used later.
Where to get
1/4” NPT x Tube OD 3/8”
(Nut and body)
Tube ID 1/4” OD 3/8”