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Offered is ONE DSL Filter.  Two are available.  If you purchase two, the shipping will not increase.  If Ebay sends an invoice with increased shipping for the second filter I will refund the increased amount. 

Here is specific info about the filter:

Manufacturer = 2Wire

Model = LFT4-2 (for two line phones) 

2Wire 2-Line Inline Filters are for single line telephones or phoneline devices (such as fax machines, answering machines, and analog computer modems). 

The 2-line inline filter installs easily between the phone jack and telephone device.

 Once the filter is installed, telephone devices will be completely isolated from the DSL frequency spectrum, resulting in clear phone service. 

Eliminate Interference Ensures optimized DSL connections and "total isolation" of analog noise, interference, and modem errors. 

Compatible Complies with G.lite ADSL, Full-Rate G.dmt, final T1/E1 specification, and HPNA version 1.0 and 2.0 technologies. 

Connect Multiple Filters Supports up to five (5) phone filters without any degradation in line quality. 

Technical Specifications All 2Wire DSL filters ensure optimized DSL connections and "total isolation" of analog noise, interference and modem errors. 

• Usage * 2Wire DSL filters can be used with telephones, fax machines, and analog modems that share a DSL line or use home computer networks (HPNA), or both.  
• Use one filter for each telephone device. If several devices are connected to the same telephone wall jack, use only one filter between the first device and the wall jack.
• Complies with Full Rate G.dmt (G.992.1) and G.lite (G992.2) ADSL. 
• Complies with the final T1/E1 specification. 
• Stopband rejection greater than 25 dB beyond 50kHz. 
• Passband insertion loss is less than 1.5 dB through 4 kHz. 
• Complies with HPNA 1.0 and 2.0 specification.