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Siemon's 1-, 2-, 3-, and 4-pair S110 test adapters provide a convenient way to test 110-type connecting blocks. These adapters plug directly onto any 110-type connecting block and provide a modular jack for connection to test equipment or patch cords. It is the only 110 style test adapter that can be attached to both terminated and unterminated 110-type connecting blocks. The 2-, 3-, and 4-pair adapters are end-stackable, and are polarized to prevent incorrect insertion.