# Duotight Female Flare Fittings

Duotight fittings are an easy way to make leakproof seals quickly and reliably. The female flare
 fittings are a unique fitting that seals without the use of an o‐ring, washer or thread tape.

These flare fittings require a small amount of deformation in the tapered/flared profile so a specific
 amount of compression is achieved.

This instruction sheet will enable you to easily determine the correct level of seal compression
 without the need to tighten the fitting excessively.

<figure><img src="/files/TsRlTFUjrW0ErP7Waea5" alt=""><figcaption></figcaption></figure>

{% stepper %}
{% step %}

### Hand Tighten The Duotight

By hand, tighten the female flare (FFL) Duotight fitting onto the male flare (MFL) of the ball lock
&#x20;disconnect or regulator thread. Do this up as tight as you can with your fingers alone.

<p align="center"><img src="/files/cIGqPgqTMSZSNB6OGn6d" alt=""></p>
{% endstep %}

{% step %}

### Mark Both Sides

Use a marker and mark both the FFL and MFL sides of the fitting.

<p align="center"><img src="/files/V7MObOIU9vWOuUShvaL0" alt=""></p>
{% endstep %}

{% step %}

### Tighten With Shifter

Paying attention to the markings in step 2, tighten the duotight fitting with a shifter and rotate the
&#x20;fitting an additional 180 degrees so the two markings are on opposite sides.

<p align="center"><img src="/files/m09PJ9owxzIDugd9EOmo" alt=""></p>
{% endstep %}

{% step %}

### Test For Leaks

Submerse the whole disconnect in a glass of water while the fitting is at 30psi and check for
&#x20;leaks/bubbles. If any bubbles are detected, repeat step 3 and rotate the fitting by another 90
°.

<p align="center"><img src="/files/JuxFTCofdM1rYEuZDkPo" alt=""></p>
{% endstep %}
{% endstepper %}


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