Abstract: The present disclosure pertains to cryogenic devices and related methods. A ferrule coupling according to at least some aspects of the present disclosure may include a male fitting including a bore; a female fitting including a bore, the female fitting sized to receive the male fitting; a conduit sized to fit within the bores of the male fitting and the female fitting, wherein a circumferential gap exists between an exterior of the conduit and an interior surface of the female fitting demarcating the bore; a first ferrule including dual conical surfaces and a cylindrical bore, the cylindrical bore sized to receive the conduit; a second ferrule including dual conical surfaces and a cylindrical bore, the cylindrical bore sized to receive the conduit; and/or a washer including dual conical surfaces and a cylindrical bore, the cylindrical bore sized to receive the conduit.