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R820 PCB A01 R820 Solid State Relay, 24 VAC Electronic PCB, 1 or 3 phases; replaces 021 0474 Viconics Description_Brass Nipple 1 Diameter All True Union style valve Selection Guide Valve Body All True Union style valve union nuts shall have Buttress threads Standard O ring Seal Seating Disc & Seals (Applicable on resistive loads only) The R820 series consists of SCR’s power controls replaces 021 0474
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