Reusable titanium/PEEK hybrid ferrule for UHPLC connections. Hand-tight with the original EXP fitting to 8,700 psi, or up to 20,000 psi with the EXP2 nut and driver. For 1/16" OD stainless steel tubing. Not recommended for PEEK tubing. Use with any EXP or EXP2 fitting. Replacement for 220-91522-34.