For OEM and reseller applicaitons, UHPLC fittings are customized to specification.  Fittings 1 (a, b, & c) are the 'standard fitting shown in three OEM coded colors in various stages of adjustment.  Fitting 2 is a narrow profile adaptation of the basic UHPLC fiting IP for an OEM application.  Fitting 3 is a new IP.  It can be used with biocompatable tubings (PEEK and PEEKSIL) to greatly extend the pressure rating to 10,000 and 15,000 PSI. 

Best Instrument, Inc. manufactures a variety of fitting styles with UHPLC pressure capability and most importantly, low dispersion operation.  Fittings are typically supplied on stock and custom tubing assemblies manufactured of 316 stainless steel in rigid (1/16"OD) and flexible (1/32"OD) diameters.  PEEK and PEKSil is available. 

The BioUHPLC(tm) fitting. A Patent Pending Biocompatable UHPLC fitting for PEEK and PEEKSIL tubing at 10-15,000 PSI depending on tubing type. Super small, and holds extreme pressure at minimum dead volumes with minimal tubing distortion or twist.

Shown above is a one of our column couplers.  This one is formed specifically for the Waters Acquity system.  Is features a 17mm diameter 'U' shape, and slight orthagonal offsets.  It is terminated with two UHPLC fittings.