Unbalanced seal

• Not hydraulically balanced to generate low heat at the seal faces. Typical of original equipment designs.

Unfilled carbon

• Containing carbon/ graphite and nothing else. Filled carbons contain inorganics that will be sensitive to some chemicals and temperature extremes. Unfilled carbons are the preferred seal faces.

U.S.C.S.

• United States Customary System. All dimensions are in inch units.

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