Our Super Flangeless Nut is very easy to use and is an excellent choice for those connections that need to be broken frequently and tubing assemblies because they swage onto the tubing. Manufactured from PEEK it offers superior solvent resistance. It has a 1/4-28 Flat-Bottom port configuration and is for 1/16 and 1/32 OD tubing . It comes in natural, blue, black, green, red and in a 10 pack (natural).