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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
The 3M CUNO Tank Kit is a reverse osmosis tank for use with the following water filtration systems:
The 3M Cuno 40 Gal. Hydropneumatic RO Storage Tank is made of traditional fiberglass, also known as fiber-reinforced plastic (FRP). This hydropneumatic water tank features a 1 1/4 inch ball valve assembly. This fiberglass water tank measures 55 inches high and 24 inches deep, and weighs 87 pounds. This Cuno fiberglass tank is also known as 3M part number 5591203.
The 3M CUNO Fiberglass specifications: