Product Information Thread: NPT Select a Product Part NumberMaterialThread Size B3Plated Steel1/2" (15mm) B8Plated Steel3/4" (20mm) B18Plated Iron1-1/4" (32mm) B23Plated Iron1-1/2" (40mm) RB13316 Stainless Steel1" (25mm) RB23316 Stainless Steel1-1/2" (40mm) B33Plated Iron2-1/2" (65mm) B38Plated Iron3" (75mm) B13Plated Steel1" (25mm) RB18316 Stainless Steel1-1/4" (32mm) RB28316 Stainless Steel2" (50mm) CCPlated Steel3/8" (9.5mm) RB8316 Stainless Steel3/4" (20mm) B28Plated Iron2" (50mm)