One piece reusable high pressure fitting. Stainless steel with polymer front cone, for pressures up to 25,000 psi. The longer stem makes it recommended for use with column switching valves, but can also be used for pump and SIL inlet connections to the mixer and SIL outlet connections to a column or guard holder. For the shorter stem fitting, use 220-91522-04. Equivalent to 228-53204-00.