Easy to install. The 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. Dimensions: 16 In. W x 16 In. H x 21 In. L.