PEEK in the analytical instruments industry has been very successful application of the instrument to change the channel or switch to a different brand of column material using PEEK tubing and fittings will be very convenient. PEEK tubing is easy to connect, PEEK connectors not only without tools, hand screw can be fixed, and easy to adjust the length of the pipeline outside the cone hoop, convenient and different brands or specifications of the column phase. PEEK tube with inert to most chemical solvents and biological compatibility with other characteristics, can replace stainless steel, PTFE tube for conventional liquid analysis system. PEEK with stainless steel pipes and tubes of different titanium, PEEK tube with toughness, easy interception, PEEK polymer can be used pipe fittings.