HUB Parts › Sink Drain Fitting (Legacy) Image 1 of 2 Image 2 of 2 Sink Drain Fitting (Legacy) $5.00 Quantity: Add To Cart Added! This fitting connects to the sink drain connector.This fitting is necessary when connecting to the legacy 4" deep sink. This fitting connects to the sink drain connector.This fitting is necessary when connecting to the legacy 4" deep sink.