Factory pre-charged to 40 PSI for efficiency - extends pump life by providing more water between pump cycles compared to standard tanks. Heavy-gauge steel construction for maximum durability and extended life. Precision press fit design - minimizes gaps between components, reducing corrosion and seam leaks. Convenient size - ideal for cabins and summer homes. NSF-61 approved. Replaceable air/water separator. Equivalency rating: 15 gal.