H&B suction nozzles work great and last longer then others. They are made from 14ga aluminized steel for durability and longevity. They do come with a 3.5″I.D. rolled stainless steal ring welded to the tip for less chances of clogs and better flow when lager size rocks happen to get stuck. These suction nozzles are 4″O.D. in diameter and work with any 4″ suction hose. Inlet hose fitting is a welded 1.5″ NPT (national pipe thread) that any will accept a 1.5" pressure hose.Requires a pressure “around” 250GPM (gallons per minute) or 15,000GPH (gallons per hour).