a spout , especially suitable for a heavy duty liquid detergent container fitment , is made by thermoforming . preferably the spout is part of a fitment which includes a bottom wall extending from the bottom of the spout wall , a circumscribing wall surrounding the spout and extending from the bottom of the bottom wall and a peripheral radially extending flange extending from the top of the circumscribing wall . the thermoformed spout / fitment finds special use in plastic containers having inside blown threads . the inside blown threads mate with external threads on a closure .