PAE Reverse Osmosis Tanks are constructed of FDA approved materials and undergo several quality tests for structural integrity to provide a reliable, long-lasting product.4 GL RO Water Storage Pressure TankSpecification Total Volume: 4.4 Gallons Holding Capacity @ 40psi: 2.8 Gallons Dimensions: 14.7" x 11.2" Connections: 1/4" Male Threads Color: White Patented stainless steel water connection NSF Certified 1 Year Warranty