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Continue to ChatTDR-FSB-F-1S-N/06-24D - 24D DC, Exchange Key, 3NO/3NC, Brass, Castell TDR Time Delay Remote Unit With Electrical Isolation https://www.concretespares.ie/product/tdr-fsb-f-1s-n-06-24d-24d-dc-exchange-key-3no-3nc-brass-castell-tdr-time-delay-remote-unit-with-electrical-isolation/