Force EXP Guard Column Cartridges. Free-Turn architecture lets you change cartridges by hand without breaking inlet/outlet fluid connections—no tools needed. Patented titanium hybrid ferrules can be installed repeatedly without compromising high-pressure seal. Auto-adjusting design provides ZDV (zero dead volume) connection to any 10-32 female port. Maximum cartridge pressure: 600 bar/8,700 psi. A Restek LC guard cartridge in an EXP direct connect holder is the ultimate in column protection. Product Name: Force Biphenyl EXP Guard Column Cartridge. Product Type: HPLC Guard Cartridge. Size: 5 x 4.6 mm. Units: 3-pk.