HYDRA-FLUSH's Patent Pending Continuous Upward Force Design Eliminates Fall Offs and Blow By Experienced With Static Locking Flush Devices Like "Fake-A-Lake", "Flush Buddy" and West Marine's Adjustable Inboard Flusher. After 20 Years in the Marine Service Industry, We've Tried Them All; No Other Marine Engine Flush Device Compares to HYDRA-FLUSH. Don't Waste Your Time and Money on Inferior and Cheaply Made Marine Engine Flushers. Rugged American Made Ingenuity-Designed and Manufactured in Traverse City, Michigan USA from Predominantly American Sourced Materials. Patent Pending Modular Manifold Design Allows for a Variety of Inserts for Specific Marine Engine Raw Water Supply Applications-The Manifold is Made of 6061 Aluminum, and Machined in the USA--You'll Never Have to Deal With Cross Threaded and Stripped Out Plastic Hose Connections Again!