Home / HVAC / Orifice Nat 146-15-031 Orifice Nat 146-15-031Price Not Available Price may not be up-to-date. Out of Stock View Product Part Number: 146-15-031 Brand: DUNKIRK RADIATOR CORPORATION Seller: Sears PartsDirect Category: HVAC Possible Matches$66.93ALL-CARB 154-0733 Carburetor 146-0660 146-0697 Replacement for Onan... Description Orifice Nat