The ADSL Microfilter is a universal filter unit designed for use with BT Sky and other modem telephone broadband connections. , This white microfilter features a 1:1 connection split/duplication and female DSL/Phone (RJ-11) connectors. Compatible with both RJ-11 and RJ45 connectors, this versatile device allows for easy setup and reliable Ethernet connection for your computer or other networking devices.
eBay