If there is air in the line.

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<blockquote class="wp-embedded-content"><a href="https://linemarking.swancorp.com.au/video/if-there-is-air-in-the-line/">If there is air in the line.</a></blockquote>
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</script><iframe sandbox="allow-scripts" security="restricted" src="https://linemarking.swancorp.com.au/video/if-there-is-air-in-the-line/embed/" width="600" height="400" title="&#8220;If there is air in the line.&#8221; &#8212; Swancorp Line Marking" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe>
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