The Coaxial Terminators - F-Type - 5 pack from the Computer Cable Store is used to avoid signal interference in the form of RF signal reflection at the end of a cable or daisy chain.
Inline Attenuator Pad - F-Type RF - 10dB from Computer Cable Store. Female to Male Attenuators, Monolithic Ceramic Printed Board Circuitry, Nickel Plated Machined Brass Construction, DC Power Blocking