INSERTA® ICD D03 Check Valve Modules are a compact means to provide check and fixed orifice flow control in a D03 stack assembly. Each module may be ordered with either one or two INSERTA® ICS Check Valves, Slip-in type. The INSERTA® ICS Check Valves, Slip-in type, can be installed with the free flow in either direction. Steel construction allows operating pressures up to 5000 psi. In-line flow paths through the valve inserts minimize any additional pressure drops and wasted horsepower.