Profile: Staples & Pfeiffer, Inc. offers duplex, simplex and fabricated strainers for maritime, oil refinery & military applications. We specialize in fabricated strainers and baskets. Our duplex strainer uses a tapered plug design with twin baskets and includes diverter handle to switch from one side to the other. We manufacture simplex strainer, which is used to remove damaging debris from liquid flow that is interrupted for cleaning baskets.