This is the ideal pressure vessel for residential and light commercial water softener/filtration applications. Structural Poly Glass™ Pressure Vessels provide years of reliable service for water conditioning and filtration applications. These slim diameter offer unmatched strength and chemical resistance. Structural's patented manufacturing process creates a seamless polyethylene shell that is wound continuously with miles of fiberglass reinforcements and sealed with epoxy resin. Computer-aided winding machines and other customized equipment are used to create a product that offers outstanding performance and durability. Features & Benefits 8" x 44" - 1.16 cu/ft. Maximum Capacity 2-1/2" Top Opening Natural Color Unmatched for strength and chemical resistance 10-year warranty Materials of construction: Inner shell of polyethylene Maximum operating pressure: 150 psi Maximum operating temperature: 120°F Safety factor: 4:1 Minimum burst at 600 psi Tested to 250,000 cycles without leakage NSF Certified Minimum burst at 600 psi Tested to 100,000 cycles without leakage