Mini Precision Nozzle Body (4.00 in.) is a direct replacement for 017257-1
Check Valve O-ring (-125) is a direct replacement for A-0275-125 and 400043-125. This is also included in the 015866-1
Poppet Spring is a direct replacement for A-1606 and 400045-1. This is also included in the 015866-1
Bleed-down Valve Body is a direct replacement for 001822-1 and 100133-1
Inlet Poppet is a direct replacement for 015384-1, 010011-1 and 100058-1. This is also included in the 015866-1