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The 378-K control knob screw assembly is used on Aqua Environment 415, 635, and 873 series regulators.
SKU 873-5000
SKU 415B-5000-O2
SKU PB415-677
SKU 635-6K
SKU 9450
SKU 9625
SKU 9616
SKU 9613
SKU 9627
