A two-component cross valve for controlling the fluid flow through a fluid conduit, the cross valve being injection-molded in two steps with no need for assembly after the injection molding procedure. The valve comprises a valve house with a plug inside it, and it has sealing means in the form of variations in the transverse sectional area of the plug and house along their lengths. Thereby, a cross valve is obtained which does not require a viscous sealant, such as silicone, to eliminate the risk of leakage, when the valve is open.