Parts that need a sniff test are placed in three-liter jars with specialized foam seals (standard-smelling rubber seals could contaminate the testing).

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The joints between the half-pipes have rubber seals to stop the contents leaking, and each half-pipe has a vertical pipe connected to it, to introduce or dispose of the fluid concerned.

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And we're looking to increase production, as I said, so we can slowly close those vents and see how the containment cap is working and whether or not any oil is forced down by the pressure through the rubber seals, as we've talked about before.

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