A fitting for use with metal, corrugated tubing having peaks and valleys, the fitting includes a nut configured to receive the tubing； a sealing member for placement in a valley of the tubing, the sealing member including a sealing surface； and an adaptor configured to be press fit into the nut, the adaptor including an adaptor sealing surface； wherein upon assembly, the adaptor is press fit into the nut and the tubing is compressed between the adaptor sealing surface and the sealing surface.
