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McDonnell & Miller model number SA159-17 is a black "Y" assembly, which is a part of the complete MA-159 and MA-259 quick hook-up fittings, for model number 42A, 47, 47-2, and 64A controls. Quick hook-up fittings allow for installation directly into gauge glass tappings on the boiler and put the gauge glass onto the unit.
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Replacement Part
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