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Although bucket spouts are still available, most spouts used in the maple industry currently are plastic and designed to be used with vacuum. Spouts are constructed of food-grade nylon or polycarbonate and are smaller in size (5/16" diameter) than earlier spouts. Increasingly, spouts are generally intended to be used for one season, and are then disposed of or recycled, and replaced with a new spout each season to minimize reductions in sap yield caused by microbial contamination. Spouts are generally one piece, but may also be made in two parts, referred to the stubby (tubing end) and adapter (tree end), which are mated together when in use.