3-Way Anesthesia Style Stopcock Standard Bore Extension with Injection Site, Non-Vented White Caps, Male Luer Lock. Smiths Medical has a wide selection of standard bore extension sets featuring various add-on devices including stopcocks, manifolds, Y-injection sites, and one-way valve manifolds. These extension sets enable higher flow rates and are widely used in Anesthesia, adult ICU, and the OR. Many of our standard bore extension sets are available in non-DEHP formulation materials. All sets are provided as sterile.