These modular design isolators and circulators provide coax units with the inherent advantages of drop-in devices, including good heat sinking and high power terminations. Three models span frequency bands from 800 MHz to 14 GHz. Isolators can be equipped with 10W or 50W terminations. Optional mounting hole geometries are provided. Additional designs are available with 200W terminations and reverse power monitoring tabs. All models can be encapsulated for high peak power applications.