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Pigtail connectors are flexible hoses that bridge the cylinder valve outlet and the regulator inlet, letting you connect safely even when the regulator is mounted in a different position or uses a different inlet fitting. Because these connectors accommodate several regulator designs, they’re commonly used with first-stage regulators, integral two-stage regulators, and automatic changeover regulators. That versatility is why this option is the best answer: it reflects that pigtails aren’t limited to a single regulator type but are typical for multiple setups. Always match the connector to the regulator and valve fittings and check for leaks after establishing the connection.