Industrial Goods and Services Fluid and Gas Control Gaskets and SealsAC DePuydt, Inc. Welcome to the virtual seal house with everything! Hydraulic Pneumatic Packing & Seals Standard Metric Since 1952, A.C. DePuydt, Inc. has been distributing quality hydraulic seals, pneumatic seals and O-rings at the lowest prices in the industry. Today, we strive to give every customer the best buying experience possible. We have one of the largest inventories of hydraulic and pneumatic seals in the United States. You'll find O-rings in every standard (inch) size possible and in a variety of materials. We als