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Armstrong 47K17 .30 WC pressure switch, replaces; 40405009, 40405-009, 43336009, 43336-009, 43341003, 43341-003, 44819009, 44819-009, 44820003, 44820-003, 45695001, 45695-001, 47K1701, R40405009, R40405-009, R43336009, R43336-009, R43341003, R43341-003, R44819009, R44819-009, R44820003, R44820-003, R45695001 and R45695-001.