The AD-N10P4310P-1 from Amphenol RF is a Between Series RF Adapter with Return Loss -18 dB, PIM -163 dBc, Contact Resistance 4 Mohms (Outer) to 6 Mohms (Center), Frequency DC to 6 GHz, Insertion Loss 0.1 dB. More details for AD-N10P4310P-1 can be seen below.