452IN-175-F Regulators are designed for medium to heavy duty gas welding, cutting, and heating applications. It is a Harris style regulator with a 2-3/4" diaphragm and a Victor style seat mechanism. 452IN-175-F has a 2" gauge, Stem type seat assembly for more reliable seating, Forged brass body, Chrome-plated housing cap, self re-seating external pressure relief valve and a sintered bronze inlet filter.