Attention ISP's and Telephone companies. Surplus Traders can supply you with bulk packaged ADSL Z200SM filters at a super price (may be slightly scratched from bulk storage). These filters block wide-band RF interference from cordless phones and other wireless sources up to 400 MHz. They works with any single line phone, fax machine or dial-up modem. They plugs into any standard phone jack. They blocks interference between voice and DSL/HPN. WA738 - 2022 in stock