Nuts, Ferrules and Washers
VICI Jour offers two types of low-pressure fittings for 1/4-28 flat-bottomed fitting details:
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Flangeless connections utilize several ferrule designs. The ferrule grips the tubing as the fitting is tightened, without significantly reducing the tubing ID.
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Flanged tube end fittings are held onto polymeric tubing by a flange pressed onto the port with a nut and polypropylene washer. The washer protects the flange, yet never comes in contact with the mobile phase.
More information on Properties of Polymers
