IDEX Flangeless Fittings are designed to include both a nut and ferrule for yIDEX convenience. Flangeless fittings are excellent replacements for flanged fittings. Flangeless fitting are dependable, easy to use and easy to replace. It has a 1/4-28 Flat-Bottom port configuration and is for 1/16 OD tubing. IDEX Fitting System comes with the P-200 ferrule.