Tri-Clamp Topcap with Valve and 1/4" BarbTri Clamp Tri Clover Top cap with Valve and 1 4" Barb Pre installed 1 4" hose barb (Fits 1 4" ID Hoses) and 304 stainless steel ball valve on a Tri Clamp endcap. These endcaps and valves and nitrogen tested for leaks to ensure safe usage of any extraction system. Barb endcaps are useful when connecting flexible tubing to the barb connection to transfer fluids easily or even pull a vacuum on an extraction system instead of using flared connections.