POLYPHASER Ultra-low PIM, DC Block RF Surge 4.3-10 Protector. Using patented SX filter design combined with a 4.3-10 connector, the TSX-4310FM-P is engineered to support 4G LTE and cell bands from 698 MHz to 2.7 GHz. Bi-directional, female/male connectors. BF4310 flange to bulkhead 4.3-10 adapter kit available.