Stainless Steel Welding Nipple (A2 / T304 Stainless Steel) 3" BSP Made from Welded Pipe Thread Size: 3 Inch BSP (British Standard Pipe Size) D (mm) : 88.9 L (mm) : 55 mm Sp-Th (mm) : 4 Threaded fittings according to UNI EN ISO 228-1:2003 (UNI 338) Gas thread not watertight (Internal and external threads are parallel) Please Note: Dimensions are subject to slight variations (different production line batches) T304 Stainless steel provides a corrosion and oxidation resistance, however it can tarnish. Used extensively in every day life.