For Bischoff 2200, Anspec SM909, Alcott Micromeritics 760 microbore HPLC pumps. KEY FEATURES Includes OPTI-MAX® check valve housing and cartridge PEEK cartridges intended for biocompatible HPLC systems with nonmetallic flow paths or high percentages of THF Ruby/Sapphire recommended for strong acidic mobile phases Ball and seat set is individually matched ensuring optimal performance Features Free-Turn