Profile: Preferred Products Design, Inc. is a provider solutions for standard or custom quick connect fittings for all pneumatic applications. We offer a complete line of sintered metal products including sintered metal mufflers, filters and bearings. Mufflers are available in pipe sizes ranging from 10-32 to 1″. These mufflers are available in brass, stainless steel, nickel plated brass wire or sintered powder. The application of our products include filter, silence pneumatic noise, arrest flames, control flow and separate fluids with different surface tension or reduce friction.