Coupling Reducer Nut Zinc - 3/8"-16 to 1/4"-20 (1/2" F x 1" L)- Qty-100 Go to amazon.com Related posts Expert choice for coupling nut 3/8-16 DescriptionCoupling Reducer Nut Zinc - 3/8"-16 to 1/4"-20 (1/2" F x 1" L)- Qty-100