Our Precolumn MircoFilter w/PEEK frit connects directly into microbore or analytical columns. The void volume used is the design of this MicroFilter eliminates mixing of samples in the mobile phase. It is designed for 1/16 tubing OD. This assembly includes (5) A-735, (1) F-132, (1) P-416. The M-560-1 comes with one PEEK frit ( A-735).