Camelbak Mil Spec Crux Replacement Tube, Coyote Tan, Fits Mil Spec Crux Reservoir, Includes Pure Flow Delivery Tube, Insulated Cover, QL Hydrolock, Big Bite Valve and Cover, Quick Link Connector 2039201000 The Mil Spec Crux(TM) Replacement Tube with Quick Link(TM) System keeps every sip insulated from the elements. Clicks easily into CamelBak(R) Mil Spec Crux(TM) Reservoir with Quick Link System.