Vendor: Water Worker | Vendor # HT-20BWater Worker vertical pre-charged 20 gallon well tanks are manufactured in the USA to the highest quality standards and offer a 5-year warranty.Features and Benefits: Easy to install Maximum 100 psi pressure rating for residential use Heavy-duty diaphragm is designed for extended life 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