POLYPHASER's ultralow PIM, DC block RF surge 4.3-10 protector. Using patented SX filter design combined with a 4.3-10 connector, the TSX-4310FF-P is engineered to support 4G LTE and cell bands from 698 MHz – 2.7 GHz. Bi-directional, Female connectors. BF4310 flange to bulkhead 4.3-10 adapter kit available. UL497E Certified.