Easy to install. Heavy-duty diaphragm is designed for extended life. Maximum 100 psi pressure rating for residential use. Locking ring provides an airtight diaphragm seal for years of dependable service. High grade polypropylene liner is non-metallic for clean, fresh, great tasting drinking water. Weather resistant paint system withstands damp environments without corroding. Durable steel base provides strong support. NSF Standard 61 listed meets FDA requirements for potable water 5 year warranty. Date coded label on tank determines warranty life and is needed to validate claim. Dimensions: 16 In. W x 16 In. H x 21 In. L.