4 Dredge Instructions
4" Dredge Instructions . Floats are held in place by the use of 8 push pins The 2" pressure hose assembly screws onto the pump with a 2" pressure hose ... through the Keene Library of Books, such as The Gold Miners Handbook, Dredging for Gold or Advanced Dredging Techniques. The vacuum on a portable dredge is created by a "venturi principal".