12-position manifold with PTFE liners and stainless steel guides to direct sample flow into the collection vessel. The disposable liners eliminate contamination between consectitive samples extracted at the same valve port. Compatible with any standard male luer SPE cartridge. Individual screw-type valves in each SPE port provide precise flow control. Easily modified sample collection rack supports a wide variety of collection vessels. Includes plate for 16 mm test tubes; 12 test tubes (10 x 75 mm); 12 liner guides (stainless steel); 100 quick-replace disposable liners (PTFE). Maximum vacuum 20" (50.8 cm) Hg. For replacement liners, use REST-28310-VM.