Headquartered in Houston, Texas, MAC is well-positioned to serve any valve manufacturer and valve repair facility in North America via either competitive gear programs or through its state-of-the-art warehouse facility, stocked with gears available for shipment within 24 hours. PRODUCTS: Sambo Gear Boxes Most Sambo gears are designed to be both manual or motorizable and includes bevel gears, spur gears, worm gears, planetary gears, torque limiters, and much more. Evolution Valves Evolution Valves is a UK manufacturer of low-temp valves, suitable for LNG plants, aerospace, and more due to its high quality cryogenic abilities. We are committed to providing our customers with the best products out there at the best price and our number one priority is customer service.