The symmetrical design allows the Vanity Sink Cups to be used on both sides of the sink bowl. Part Number 30-BIVanSet Top Surface Area (per cup) ~67 in2 Base Surface Area (per cup) 115 in2 Top Seal Part # 12-701-10-04 Bottom Seal Part # 12-701-10-11 How to Measure Fittings & Suction Cup Heights

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