swab with relief valve

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Christmas tree (oil well) — Oil well Christmas tree In petroleum and natural gas extraction, a Christmas tree, or tree , (not wellhead as sometimes incorrectly referred to) is an assembly of valves, spools, and fittings used for an oil well, gas well, water injection well,… … Wikipedia
First aid kit — For other uses, see First aid kit (disambiguation). Large and small first aid kits used by the British Red Cross for event first aid, in the internationally recognised ISO green with a white cross. These kits also feature the red cross which is a … Wikipedia

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