VidaRF offers Model: VDC-04200450-3 Drop-In Circulator Freq: 420-450 MHz, 400 Watts, Loss 0.25dB, VSWR 1.20, and Isol 21dB ,Temp -40 to +85C. Circuit tab can be straight or bent flush with base for surface mounting. Dim: 1.375x1.375x.560” The new rugged design uses a machined steel housing, screwed on cover and is fully tested to handle shock, vibration, thermal shock, and moisture. To help ensure long term performance in a variety of applications, these packages are Beryllium oxide (BeO) free and Neodymium (Nd) free.