MART Power Washers cabinets are made of 7 ga and 1/4 inch ASTM A-569 sheet steel. For severe duty applications, 304 or 316 stainless steel is also available. All structural members are high strength carbon steel throughout and wire welded. Structural angle and box tubing are 1/4 inch to 1 inch wall thickness. All cabinet seams are continuous MIG welded with E-70 electrode for strength and integrity, and to render cabinet 100 percent leak proof without caulking.