Niehls A. Christensen made the very first experimental o-rings in the early 1930's. During the 1940's, o-rings were declared the official seal for United States Air Force hydraulic systems. Now, decades later, o-rings are one of the most commonly used seals around the world because of its simplicity and remarkable sealing abilities. A large number of fields and industries depend on o-rings, including irrigation! Irrigation o-rings come in a selection of shapes and sizes, all of which are offered conveniently on our website. Please browse through our page of irrigation o-rings. If have any questions whatsoever concerning irrigation o-rings or anything else on Basic Irrigation, please do not hesitate to contact us for any additional information that you need!