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The size of the oxygen and acetylene hose connectors is 9/16"-18, suitable for 1/4" and 3/16" double hoses. Fits most 9/16"- 18 UNF double welding hoses. The left connector of the oxygen and acetylene hoses is connected to the acetylene hose (red), and the right connector is connected to the oxygen hose (green). The connector length is 31.7mm, the hexagonal diameter is 16mm, the thread diameter is about 14mm, and the thread length is about 9mm. The connector is made of brass, which is rust-proof and strong, with good durability, and can be used for a long time in harsh welding environments without damage., Weight: 0.1322773572 pounds, Manufacturer: LT Easiyl