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 tasking drinking water. Weather resistant paint system withstands damp environments without corroding. 3/4 In. hex connection for easy in-line mounting. NSF Standard 61 listed meets FDA requirements for potable water. 5 year warranty.