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Thoroughbred Replacement Cylinder Cap - fits Select Argon, Argon/CO2, Helium, Nitrogen and Oxygen Cylinders, Model Number TBCH-40: Amazon.com: Industrial & Scientific
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Amazon.com : 6 Pieces Solid Brass Refill Cap 1 LB Propane Bottle Cap Gas Tank Cylinder Sealed Cap Protect Cap : Patio, Lawn & Garden
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