Pipe line marker
Vent pipe, test station, marker in
background. Actual pipe line in front.
Pipe line marker at right.
Pipe line marker & flags
In actual use.
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| Aerial patrol
marker & main line valve |
Pipe line marker |
Pipe line marker |
Vent pipe, test station, marker in background. Actual pipe line in front. |
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| Vent pipe & test station | Vent pipe &
test station at left. Pipe line marker at right. |
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Pipe line marker & flags |
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| Pipe line marker | Pipe line marker & vent pipes |