The thread is 3-1/8'' diameter.
Thoroughbred Replacement Cylinder Cap, Fits Select Argon, Argon/CO2, Helium, Nitrogen and Oxygen Cylinders, Model# TBCH-40

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- Designed to meet the following standards: CGA V9, EN 962, CSA B340, ISO 11117 and DOT 49 CRF
- Instron (Satec) MATS II Material Testing System model U MII 60HVL and Rockwell Testing are used to ensure these caps have the durability to withstand cylinder falls and keep the valve protected
- Cylinder valve protection is paramount when moving or storing a cylinder
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