The 145310-00SF from Southwest Microwave is a Between Series RF Adapter with Contact Resistance 2 Mohms (Outer), 3 Mohms (Center), Frequency DC to 50 GHz, Insulation Resistance 5000 Mohms, Temperature -55 to 250 Degree C, Voltage Rating 288 V (DWV). More details for 145310-00SF can be seen below.