These stainless steel port assemblies are designed for use with media storage bottles for adding and withdrawing media or liquids. The 2- port models feature a siphon vent tube and is supplied with a 45mm polypropylene blue open top screw cap and white silicone gasket. Specifications: Designed For 5637 And 5639 Media Storage Bottles.Welded, 316l Stainless Steel Construction 1/4 Inch Od Tubing Ra32 Finish Or Better.Electropolished Finish, Continuous Seal Weld.Two Port Model Features Siphon And Vent Tubes.Supply W/45mm S/Cap & White Silicone Liner.Long Tube: 8 1/2.