The Allied 12-90-0017 is a precision-engineered 9/16" - 18 DISS male auxiliary "power take-off" adapter. Designed for use with Timeter flowmeter regulators or aluminum flowmeter models, it provides a secure male check-valve connection for secondary oxygen devices. The chrome-plated brass construction ensures long-term clinical durability, while the gas-specific DISS threading prevents cross-connection errors, allowing oxygen-powered devices to plug directly into the regulator via a quick-connect or DISS interface.