In-Well Technologies offers a flexible in-the-well pressure tank.
Light in weight, this product is constructed of reinforced polyurethane; it is made of chlorine-resistant material and said not to mold, mildew or decay. Designed for wells 4 inches and larger, the 3 1⁄4-inch diameter flexible pressure tank attaches directly to the pitless adaptor and may be used with either coiled or rigid drop pipe. Intended for constant pressure systems, its applications include residential, farm and light industry settings.
In-Well Technologies, Card No. 92