to piston 310 a shear sleeve 318 is mated against the angled shoulder 212 the shear sleeve 318 has a radial hole 320 through its wall which aligns with the radial hole 316 in the piston 310 a shear pin 322 is placed through the mating holes 316 and 320 towards the annular area 113 adjacent to shear sleeve 318 a flow nozzle 324 with a male thread is threaded into the female thread 210 the flow nozzle 324 may have an internal diameter sized to restrict fluid flow between the tubing interior 115 and annular area 113 of the well to a desired rate this internal diameter can be adjusted based on the requirements of a specific well environment an erodible and or dissolvable metering disk 326 may reside in the internal diameter of the flow nozzle 324 the metering disk 326 may have one or more holes through it to permit fluid communication between the tubing interior 115 and annular area 113 the flow nozzle 324 is threaded into the first hole 116 such that it is adjacent to shear sleeve 316 the flow nozzle 324 locks all internal parts in place within the coupling 112 various sizes of flow nozzles 324 can be used and can be interchanged at any time without affecting operation of the device 118 without requiring disassembly of the device 118 and without the need for specialized tooling pressure applied to the annular area 113 of the well acts on the piston 310.