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Installation recommendations for fittings

Metallic fitting with short or long flats and two-piece metallic ferrule (V-detail)

Metallic fitting with short or long flats and two-piece metallic ferrule (V-detail)
Topic LCI-USG-0106, Last Updated 11/08/2024

The procedure for tightening metallic fittings differs for new versus reused fittings.

In order to avoid leaks, see the following recommendations in this guide:

Note: Before tightening compression screws, ensure that the tubing is fully bottomed in its connection port.
Note: Different techniques apply to installing new fittings and re-tightening previously used fittings.

First use

Note: Tighten the fitting finger-tight plus an additional 3/4-turn using a 1/4-inch open-end wrench.
Figure 1: Metallic fitting with short flats and two-piece metallic ferrule, first use
Short flats
Compression screw
Two-piece metallic ferrule
Figure 2: Metallic fitting with long flats and two-piece metallic ferrule, first use
Long flats
Compression screw
Two-piece ferrule
Figure 3: Metallic fitting with short or long flats and two-piece metallic ferrule, first-use tightening

Reinstallation

Note: For best performance, only reinstall this connection into the same port from which it was removed.

Tighten the fitting finger-tight plus as much as an additional 1/6-turn using a 1/4-inch open-end wrench.

Figure 4: Metallic fitting with short flats and two-piece metallic ferrule, reinstallation
Short flats
Compression screw
Two-piece metallic ferrule
Figure 5: Metallic fitting with long flats and two-piece metallic ferrule, reinstallation
Long flats
Compression screw
Two-piece ferrule
Figure 6: Metallic fitting with short or long flats and two-piece metallic ferrule, reinstallation tightening
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