One-piece reusable high pressure fitting. Stainless steel with polymer front cone, for pressures up to 11,000 psi. Fittings have a polymer wing at the top so it can be hand-tightened. Use for LC-30AD or LC-40 connection to mixer, SIL-30 and SIL-40 connection to mixer and columns, and CTO-30 connection to column(s). For 15K and 18K psi valves, use the longer stem fitting 220-91522-03.