IDEX NanoTight Tubing Sleeve is specifically cut to a precise 1.6 length. IDEX sleeves are carefully manufactured using FEP fluoropolymer – a highly inert, melt-processed polymer that serves as an excellent alternative to PTFE. These sleeves are available in a light tinted color that allows easy identification of the ID. They are primarily used with NanoTight Fittings and work well with Super Flangeless Fittings. It comes in purple.