This is a 10.7 gallon white pressurized RO water storage tank Stainless steel connection point one inch female .Along with an adaptor and ball valve for 1/4 inch.
Tank weighs 27 lbs and is (16) inches in diameter and (23) inches tall. Rated for up to (100) psi. (RO1070 in the photo)
Hydroneumatic, bladder, captive air, reverse osmosis storage & pressure tank are all common names for these tanks.
All
of these tanks fill a food safe bladder with water and that bladder is
surrounded by a coushion of air .Tanks rated for reverse osmosis water
storage have stainless steel connection points vs. common steel which
will corrode when exposed to pure water.